 [ Symptoms ] can not lose weight while taking lexapro i have never had weight problem and i go to exercise class 3 4 times a week  i need to lose about 5   10 lbs but this seems impossible to do i do not eat a lot of sweets nor do i overeat [ Disease ] see a urologist you are having symptoms suggestive of prostatitis an infection or inflammation in the prostate gland i am not sure if there is a relationship with your boweldiarrhea and fatigue issues so this could easily be an entirely separate medical problem