anxiety is the one and only [withdrawal] symptom that suboxone doesn't relieve for me. i realize you're not in opiate withdrawal, but it doesn't seem like it would do anything for anxiety at all. now i very well could be wrong on this, but maybe you're experiencing anti-anxiety effects from the codeine/oxycodone/fentanyl because you're getting high off of them...? when i am high on opiates, literally the last thing i feel is anxious! the doses you specified aren't high doses at all, even for an opiate-naive person, but they are definitely substantial enough to feel/alter your state of mind and even achieve a "high" feeling therefore eliminating your anxiety/depression.
i wouldn't think suboxone would be a very good choice for this purpose because the only people i know of (or have ever heard about) that have achieved any kind of "high" off of Buprenorphine are extremely opiate naive people, and they had to dose a pretty decent dose (8mg) to achieve that feeling.
Judging from the description of your "semi-chronic" daily doses, i kind of doubt that you fall into the category of extremely opiate-naive, so i wouldn't think you'd feel anything at all.. but then again, i could be wrong and it could be just enough to put you over the threshold. i'd say the only way to find out is to talk to your doc and try it out.. none of us are going to be able to tell you that it will or will not work for you.
Just keep in mind, bupe is a long-acting opioid so if you do get addicted, which is very likely, it's going to take longer and be harder to kick than the short-acting fent, oxy, or codeine.
am i right guys?