Aviane and types of birth control

I have been on Aviane for about six months and I too have experienced weight gain (after working very hard to get rid of it prior to going on Aviane...), mood swings, which are horrible just before and continue the first few days of my period, mild depression (probably a result of the weight gain), and similar pregnancy-type symptoms (swollen breasts, going to the bathroom more often, and cravings). This is the first month that I've put two and two together to recognize that the symptoms/side effects are probaby related to the birth control. I've been on so many different types of birth control, I really don't know what to switch to next. I know that I need a lo-dose of estrogen, because I frequently experience a lessened sex-drive on BC pills.