I have PCOS & for about a year now I have had regular periods... Finally after losing 50lbs, then my doctor put me on Prozac the first month I was on 20mg, I had my period but the 2nd month it came early she then upped my Prozac to 40mg and the 3rd month now I don't have a period at all feel hopeless and no motivation to do anything... Is this a normal side effect from the Prozac?