Her husband divorced her by talaaq and she married another man during the ‘iddah
Question

                I am a reverted sister living alone at the moment. I left my country to marry a man in another country. After a short time, my family started to make major problems for me, that could have caused bad problems for my husband or myself, so I left without his permission, and went back to my country. I was certain I could never go back to my husband, but I was in love with him, and missed him a lot. I decided to try to make things work for everyone. I started to talk again to my husband, and told him I wanted to return. He agreed. Problem after problem kept coming up though, and my return was always delayed for reasons beyond my control. During this time, my husband became impatient and divorced me twice. He stopped supporting me also after some time, and wouldnt allow me to find work in my country, so I was left at the mercy of whatever I could get from others to live on. My family was putting a lot of pressure on me, since they even didnt like to support me, as it isnt in our culture for the kids to stay home for long after finishing school. I was alone, and had no way to support myself. Even though I knew I was in love with my husband, I was forced to marry someone else, at least LEGALLY in my country, so I could be taken care of. I regret this action, since the man and I werent together, and we did not love each other. But I was afraid to fall into haraam, and fell into it anyways by doing this horrendous act. I am trying to fix it now, by legal divorce. However, I do not know what to do, in order for everyone to have their rights. My imaan has fallen away lately, and I am afraid of losing my Islam. I know in Islam there is severe punishment for such an act as what I did, and I need to know does that apply for my situation. I was very new to Islam when all this happened. I am also unsure if I should tell anyone what I actually did, since I was told we conceal our sins in Islam. Please help me, as I am losing my mind more every day.
Praise be to Allah.
    
    Firstly: 

    We 
    ask Allah to accept your repentance and set your affairs straight, and help 
    you to maintain your religious commitment. 

    You 
    made a mistake by moving away from your husband and exposing yourself to 
    trials and tests, and your husband made a mistake by not allowing you to 
    work whilst not sending you any maintenance to spare you from having to 
    work. 

    
    Secondly: 

    If 
    your husband had divorced you twice, as you say, then your ‘iddah ended 
    before the second marriage, then you do not have to do anything and your 
    second marriage is valid in that case. 

    The 
    ‘iddah of a woman who menstruates is three menstrual cycles. If he divorced 
    you when you were in a state of purity (i.e., not menstruating) then you had 
    three menstrual periods, when you became pure following the third period and 
    did ghusl, your ‘iddah came to an end. 

    The 
    ‘iddah of a woman who does not menstruate because she is too young or has 
    passed menopause is three months. 

    The 
    ‘iddah of a woman who is pregnant ends when her pregnancy ends. 

    If 
    the divorce was in return for payment from the woman, then this is khul‘, in 
    which case the ‘iddah is one menstrual cycle, according to the more correct 
    opinion. 

    If 
    the second marriage contract was not done until after your ‘iddah ended, 
    then it is a valid marriage and you do not have to do anything, but it is 
    not permissible for you to go back to the first husband unless the second 
    husband divorces you and the ‘iddah following that divorce comes to an end. 
    Then the first husband can do a marriage contract with you. 

    But 
    if your second marriage was done during the ‘iddah, then it is an invalid 
    marriage and does not count, and you have committed a grave and serious evil 
    by doing that. 

    Ibn 
    Qudaamah said: With regard to invalid marriages, such as marriage to a woman 
    who is married or still in the ‘iddah period, and the like, if they were 
    aware of what is halaal and haraam in this regard then they have committed 
    zina and are subject to the hadd punishment, and any child born as a result 
    cannot be attributed to the man. 

    End 
    quote from al-Mughni, 7/10 

    And 
    he said: If he marries a woman who is still in the ‘iddah period and they 
    both knew about the ‘iddah and that marriage is forbidden during that 
    period, and he had intercourse with her, then they have committed zina and 
    are subject to the hadd punishment for zina, she is not entitled to any 
    mahr, and any child born as a result cannot be attributed to the man. 

    If 
    they were both unaware of the ‘iddah and the prohibition (on marriage at 
    that time), then any child born as a result is to be attributed to the man 
    and no hadd punishment is to be carried out, and she is entitled to the 
    mahr. 

    If he 
    was aware of that but she was not, then he is subject to the hadd punishment 
    and must pay the mahr, and any child born as a result is not to be 
    attributed to him. 

    If 
    she was aware of that but he was not, then she is subject to the hadd 
    punishment and is not entitled to any mahr (dowry), and any child born as a 
    result is to be attributed to the man. 

    That 
    is the case because this is a marriage concerning which there is consensus 
    that it is invalid; it is akin to incest.  

    End 
    quote from al-Mughni, 8/103 

    In 
    that case the second marriage is annulled because it is invalid, and you 
    have to complete the ‘iddah from the first marriage, then observe ‘iddah 
    from the second marriage. Then can you go back to your first husband or 
    not? 

    -
    If he had taken you back 
    during the ‘iddah – even if that was without your knowledge – or he took you 
    back during the completion of the ‘iddah for his divorce, then you are still 
    his wife.

    -
    If the ‘iddah ended without 
    him taking you back, then he is a stranger (non-mahram) to you and you 
    cannot go back to him except with a new marriage contract. In that case you 
    have the choice between marrying him or the second one or someone else.

    The 
    point is that marrying another man during the ‘iddah is invalid, whether the 
    first one took you back during the ‘iddah or not, and whether you will go 
    back to him with a new marriage contract or not. 

    And Allah knows best.