Don't jump. Don't go on Vivitrol, it's bad news for any number of reasons. Taper the bupe down as slowly as possible. I jumped off at 0.25mg and it was too fast, the acute withdrawal was over inside of a week but the postacute remained for a long ass time. Antidepressants and benzos eventually helped. I think some of the trouble could've avoided by a slower taper, even if that sounds really slow. Eventually switch to 2mg tabs, then cut them up and even use an eyedropper to taper as slow as possible. The trick is just to take less every few days. Initially, or if you haven't been on long, you can go fairly quickly, but if you've been on it a long time you have to very gentle with your receptors. Trust me from experience even if you feel OK initially you will regret it if you jump off too quickly.