Lamictal & Seroquel

I’m wondering if anyone has experience with these 2 medications?

I’ve been on Lamictal (100mg) for about 2 years. It was working well - until it wasn’t anymore and I needed something for the hypomania. Today I was prescribed Seroquel (12.5mg) to take as well.

I’m specifically terrified about the weight gain aspect. I had problems with eating and weight throughout my teens and I don’t want to go through something like that again.