"i had to stop the combined pill (yasmin) after 3 years as i had started getting migraines. 
i am lucky my mother works at a family planning clinic so if i have any questions i just ask her. i chose the mirena coil as the copper coil has a high chance of heavy periods and cramp (which i already suffered from).
my periods seemed to last slight longer, but after around six months they have get become very very light. during the 6 months i had bad cramps when due on my period which last days, but now have really settled.
my acne came back from pre-combined pill, but i manage this with antibiotics
i have had no weight gain, but i do have a healthy lifestyle.
everyone is different, but i am glad that i perservered with the mirena."