Warm drinks symptoms and conditions

I started taking NIASPAN last Wednesday night 500mg and on Thurday night I awoke at 330am feeling like I was on FIRE. My whole body was burning and my skin was turning redder and redder by the minute. I jumped in the cold shower and stayed there for 45 min. I then started getting the shakes and very rapid heartbeat and my tongue was purple. I advised my doctor that I will not take this medicine and proceeded to throw it out. Can you imagine the long term affects of this medicine. How can a rapid heartbeat and burning feeling be actually good for you. I AM OFF THIS MEDICINE AND ADVISE anyone else to think twice about going on it.