Welcome Jenny,
I also started my flashbacks in my 30s. I think that's common. The anitdepressants will make you jittery and nauseous for a short time. When I started prozac it only lasted for a few days. I know that weight gain and sexual side effects is a problem with the medication. I haven't seen too much of a problem with weight gain. I've stayed the same. My daughter takes zoloft and she has stayed the same weight. A proper diet and regular excercise should help.
Feel free to start a new thread and talk about anything that's on your mind. The more support the better.
Hugs,
MG