Gaining weight from medication changes

Has anyone had experience with gaining weight from medication changes? As of last fall, I weighed around 125lb on a 5'4 frame. My insurance company messed with my birth control prescription (I was on Yaz with no weight gain) and my weight sky-rocketed to almost 15 lbs more. Summer clothes that used to be a bit loose are now on the much snugger, should-I-even-be-wearing-this, side. 

I'm in graduate school and work full time, so I have a regretfully sedentary lifestyle with the exception of hitting the gym a few times a week, which I've always done. I've been eating even healthier and more low-cal than ever before for the last two months to combat the weight gain, and it's still there. I've also recently been diagnosed with Crohns and have a hard time keeping my body from rejecting what I eat. Yet the weight is still there! I just can't get rid of it, let alone keep it from rapidly gaining. I've been off the medication for a week now. I knew not to expect instant results, but I still feel incredibly hopeless. 

Has anyone else had a similar experience with birth control weight gain? How long did it take for it come off naturally? I can't cut my calories much more without being super unhealthy and there just aren't enough hours in a week for me to double my gym visits. 

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