AG, weight issue, I can relate to this when first being tried on different mood stabilizers ans anti-depressants, I first rejected the whole thing with my pdoc on my very first visit to a pdoc, she said then there is not much more we can do if you do not wish to comply, you put yourself at risk of getting worse, and not everyone gains that much weight.
The main thing stressed is the weight you can lose, takes work and all, but is easier than watching you lose yourself, your mind due to a vanity issue.
You should have seen me when first starting treatment, I was not an easy one to convince, quite a challenge for pdoc and therapist, I finally gave in and started med treatment as I was feeling worse and worse.
When most of us start med treatment, we may experience unpleasant feelings, some of may not, if you are having any side effects when starting out, always keep under pdoc's s supervision in case a change is needed.
I just wish they would have meds that have the side effect of weight loss, some do, but I never have been lucky to those prescribed to me.
Lamictal has not caused me any weight gain, first mood stabilizer that hasn't. . . yay!
Okay, sorry I got carried away, my main point is, please do not let weight gain keep you from working with your pdoc and meds. The reply TgrsPurr gave you is a great idea.
Please take care now.

DE