550, I'm assuming that the depression you're experiencing is quite common. I'm not sure if it is a side effect of the sub or just the fact that your brain is no longer getting the spikes of dopamine it was used to getting when you were using faster acting oppiates. I do know that many on here complain of depression even with subs. I had more anxiety after my switch to subs.
I really think you should seek medical advice, before messing with your welbrutin. That's the big problem with us pill addicts. We love to self medicate. Just try to understand that your depression is not because of external factors but simply a chemical imbalance that takes time off the pain pills to normalize. You know what I mean? If you can try not to take your crazy mixed up emotions seriously or act upon them. You are definitely not alone. Please call your Dr. tomorrow. This is temporary, it gets better, ok, don't worry.