PCOS, etc

I think I mentioned that I have PCOS and my dr. put me on birth control pills to help regulate my period. Well, I am finally having a period. I was so crabby feeling last week. I am feeling better now, more like myself. I have been off the anxiety meds for months now. I am wondering if I should go back on something. My doc says if I decide to go back on them she wants me to try Wellbutrin. My sister takes it and she does fine on it. Supposedly it doesn't make you gain weight. Speaking of weight, I need to lose some...well, alot actually. I am tired of being this big. I weigh 204 lbs. I should weigh around 140. So, I need to lose 64 lbs. Wow, that is alot. I just eat all the time. I eat when I'm bored, tired, sad, etc. I don't exercise. How do I get myself motivated to get into a regular exercise routine and stop eating for all the wrong reasons???