SSRIs like Prozac affect everyone differently, so you won't know until you try it. For me, it helped with depression but made me more anxious (I have both depression and generalized anxiety.) I was only on it for a few weeks before switching to something else so can't say anything about weight gain. One of the good things about Prozac is that it's an easier one to come off of (compared to, say, Paxil or Effexor) because it takes a long time to get out of your body (long half-life). I think it's worth giving it a shot. You can always stop it if you don't like the effects it has on you. And for some side effects, they just last a week or two while you get used to the med, then go away.