Is anyone out there on anti-seizure medication and seeing weight gain from it?? I have gained 10 lbs and my wedding dress is close to not zipping up

I still have 5 months to go so it's not a total emergency but this has taken a HUGE toll on my self esteem. I have worked my a$$ off trying to loose the weight but nothing is working, which is making me feel even worse. Has anyone else gone through this or have any advice? Going off my medication or switching to another med isn't an option and I'm terrified of gaining more weight or looking like a big white sausage in 5 months. Any help or advice would be very greatly appreciated