What Causes Heat Flashes And Chills?

i am on a diet pill i take early morning its a fat burner, then took jack3d pre work out one scoop at noon worked out hard till 2 and also took my creatine for the day. i am getting through oxycontin addiction and its 4 20 right now and im having heat flashes and chills. what exactly is this from, im on day 6 of not using and am quitting completely. can i take a klonopin after all this work out stuff. i usually do to help with chills and withdrawels