Withdrawing from Welbutrin extended release and having intense problems.?

I was prescribed Welbutrin for PTSD from a car accident. Soon after taking it I was having suicidal thoughts soI immediately stopped the medication without consulting my doctor. Now my body is in serious pain...the best way I can describe it is "being crushed by a dump truck or my muscles going through a meat grinder." I am feeling intense depression. My nightmares have gotten worse. I have nausea and.... pardon me...diarrhea. I have a splitting migraine and my mood swings have gotten terrible that I am stressing out my husband to the point he is trying to avoid me. I don't know what to do since it is the weekend and the doc won't be at his office. I guess I am asking is there any way to make the withdrawal easier such as prescription medication for withdrawal from anti-depressants?