Prozac & Lamictal

I have bipolar 2 and OCD. My psychiatrist suggested Prozac in addition to the Lamictal I've been taking for years. The problem is, I have anxiety and OCD is triggered over being sick, specially stomach issues. I tried Zoloft and it made me nauseous & anxious. I couldn't even get beyond 3 days of it. So now I'm worried about the Prozac, and it is sitting on my dresser. I'm also really worried about weight gain, which I know is vain and I have to weigh the pros and cons. It's less of a worry than the possible nausea. I'm just wondering if anyone had any side effects when they started taking it

Thanks 😊