"i am 20 and was suffering from anxiety and depression after &#039;recovering&#039; from an eating disorder. pristiq made me feel so awful in the first 2 weeks but by week 3 i felt calm, i no longer snapped at people for no reason, i could concentrate during conversations and my university work has not suffered. i do feel like i find it harder to sleep (after 3 months on pristiq) and if i miss a pill by a few hours i feel very, very drowsy. i have experienced no weight-gain but have had a notable increase in headaches and a few migraines. overall the positive effects far outweigh the bad. "