I'm on methadone and Xanax, changing doctors this month... I actually quit the methadone for a bit; then, required another surgery and got back on it. Anyway, that's kinda what it sounds like. I went cold turkey, felt like I was dying (kinda wanted to). I was hot then cold, restless but tired, sometimes a bit disoriented, agitated at times, etc... I went to Health Hut, & was totally upfront about it, the girl gave me a few things for the stress and tension. The teas all taste like crap, but are effective. The main thing that helped was Centrum daily vitamins and this powder I think it was GABA something, but I added it to my drinks and it works.
Did you abruptly quit the opiates? You could be in cold turkey withdrawal. That's one possibility. Know that wellbutrin is a stimulating antidepressant and isn't usually used for primary anxiety as it can cause anxiety. I don't know that an antidepressant is what you need, but if you did for anxiety that isn't the one to start with.