I used to have a vicodin problem. I've been taking Suboxone now for about 8 months (8mg per day) and it has helped a great deal, but as recently as 2 months ago I can remember feeling great. Not high, but happy, motivated, in charge of my life. Now with the same dose I'm going back to what I used to feel (and the whole reason I started taking vicodins); I'm depressed, and I have no motivation to do anything.
I can't figure out what's wrong, have I just built up a tolerance to the suboxone and the dose isn't helping as much?
I'm trying many anti-depressants with my doctor as well, but as of yet, they aren't helpful. What do I do?

Thanks in advance