Do I hafta eat?

So a few months ago I began to realize that my meds weren't quite as effective as they had initially been. They still worked but my energy levels weren't great and my level of caring/interest was down. So after talking with my nurse we decided to add a second medication, one that I had used in the past with my current medication. So I was now on celexa and adding Wellbutrin. 

A little history - I was on both celexa and Wellbutrin about 15 years ago and had good results while using both. So I felt completely comfortable adding Wellbutrin this time. 

The reaction I had this time was not the same. It made me anxious, caused daily headaches and did not help with my  depression or energy levels at all. So after 3 weeks of constant headaches I stopped taking the Wellbutrin. 

When I went to my next appointment with my nurse i told her that I had stopped taking the Wellbutrin. We discussed what had happened when I took it this time. We then discussed any allergies or drugs I had taken before to narrow down a new option. The new prescription is for topamax and I've been on it now for a month and a half. She did warn that one of the side effects of the drug was weight loss, but since I don't normally react the same way as most  people I didn't think anything about it. A few weeks after I started taking it I realized that I wasn't eating unless I consciously thought about it. Oops. 

The appetite suppression has its pros and cons. I'm not eating out of boredom and I'm eating smaller portions. Both of these are good things. On the flip side I really didn't eat much today, a cheese sandwich, almonds, crackers. I finally fixed dinner at 6 - pierogies and green beans, but honestly all I wanted to do was lie on the couch and not eat. 

I know I need to eat. I workout. I know the correlation between food and working out. But having gained all this weight this past year there's a part of me going omg I'm not eating woohoo! How am I supposed to shut that off and start eating and exercising responsibly?! I know there isn't an easy answer but man I wish there was.