Have you had your thyroid checked? Your thyroid could be messing with your weight and your anxiety.
Wellbutrin is more likely to cause weight loss in most people. I lost fifty pounds from taking it(, but then gained most back after starting a different medication.) There are more medication options out there all the time, so don't give up on finding one that works for you, but do get that thyroid checked first.
i know lots who have gained weight on the pills you took, thats why i will not take them, i take klonopin/ativan if i need them, no weight gain and i can take as needed , i do not have anxiety everyday but if i do i take the klonoipin until i can get it under control than come off of it. ativan for a now and than thing. so yes weight gain is a side affect with thoses pills and i do know a few who did lose weight on wellbutrin. guess its your body type. good luck hope you find the right meds for you .