Hi Jane, there is overlap between anxiety and depression, and some of the meds can treat the symptoms of both. Tell your doc that you are concerned about weight gain- again, some meds are better than others in that regard. The older tricyclic anti-depressants tended to cause weight gain, but the SSRI's (zoloft, prozac, wellbutrin, lexapro, effexor, etc) which are used for anxiety and depression now as the first line treatment- not so much. In some people they even cause a slight loss.