migraine
"My neurologist put me on 4x4mg Periactin at night as a preventative for chronic migraine. I was aware of the weight gain possibility & started running & yoga. I slowly gained 5kg in 5 months. Upon noticing this, I tried even harder. With time & dedication, I was able to exercise & eat my way back down to my normal skinny weight. When I'm hit with a carb craving (which is pretty often) I eat 30mg of a healthy carb (such as a 2 inch chunk of carrot). It satisfies perfectly as long as you havent consumed a protein in the last 2 hrs. Do not turn to fatty carbs.
The drowsiness also wore off in the first week. 
I am the healthiest & best version of myself, thanks to migraines. Choose not to be a victim. I now run charity marathons & have kept my career."