My interests have changed. I wonder how to keep my previous life? Lately, I have experienced a great breakthrough in my meditation. Being able to keep equanimous in front of deep sankharas I couldn't deal with before. My heart and mind are filled with happiness and joy, and I'm constantly deepening my practice. Although, I found that I have completely lost interest in my previous world. I was on the path of writing a dissertation towards doctoral studies, in philosophy, and now I can barely open a book without thinking - what nonsense this all is, philosophers, thinkers, full of ego and ignorance. How can I follow them? I ask myself, will my past life and interests come back to me or it is a true change of heart. I have considered now a way to contribute and give others the gift of dhamma. But dhamma should be given free. And I have a family to take care of. I wanted to share and ask for useful thoughts and other experiences like mine.

:)
Thank you
You have a family to take care of &amp; livelihood is a factor of the Buddhist 8 fold path. You must earn a living. 

If you have an intellectual talent for philosophy &amp; have spent time &amp; money in nearing completion of major studies, I would suggest you consider forcing yourself to complete your studies because your qualification can be used for livelihood. For example, once you complete your PHD, you can do some studies in Buddhism &amp;/or psychology and thus branch out into that more practical &amp; benevolent field (rather than work in pure Western philosophy). Formal qualifications can be very useful things. 

For example, when I was young (23 years old) &amp; first discovered meditation, I practised for a whole year, full time, and felt very free. I did not understand Buddhism well &amp; left the meditation monastery to study psychology at university so I could learn to help people. I found the studies not practical at all; so I completed the 1st year of study, left university &amp; returned to the meditation monastery. Some years later, after I discovered certain Buddhist teachings which are for helping ordinary people &amp; returned to Western society, I regretted not completing the psychology degree. What you can do with a qualification is often more relevant than what you must study to obtain the qualification. 

I don't wish to burst your 'enlightenment bubble' but it appears you are 'attached' to this 'enlightenment'. While I am being humorous here, often ideals must be abandoned or modified for more practical considerations. 

I would suggest for you to consider (weigh up) how you could use the PHD in a more practical way. 

While you are correct in stating Buddha-Dhamma should be given freely, I personally do not believe it is a crime to earn a living from Dhamma. Many universities have Buddhist studies; the lecturers/professors must have proper secular qualifications (rather than just be monks); therefore individuals, such as yourself, must fulfill these roles. 

There are ex-Theravada monks who are now paid university professors, who still are part of the Theravada Buddhist community; including liaising with monks. They are never criticized.