I started taking Pristiq 50mg 5 days ago for depression. So far I felt absolutely nothing, not even side effects. The only difference I noticed was an increased sweating. It's almost like I'm not taking anything. Yesterday I had a really bad crisis and I'm asking myself if I should keep taking Pristiq for a few more days or if I should ask my doctor to change the medication. How long until I can feel the effects of Pristiq?