Cuticles symptoms and conditions

I started taking Zoloft 6 months ago. I have gained 15 pounds since I started taking it. It has helped me with being moody though. I have started to bite my cuticles and pick at them which I am not sure why I do this. I have to put bandaids on my fingers so I wont pick them till they bleed. It is so embarrasing that I make up stories that I cut myself gardening. I am 36 years old and am happy now and content. I dont have panic attacks anymore but the weight gain issue is really a problem for me. I am not sure what to do now. Zoloft really helped me but I dont want to be fat and chew on my cuticles anymore. I take 50mg once a day.