My husband and I are both on suboxone, I am on 1mg a day, he is on 2mg a day. I can totally relate to this! My husband's sex drive crashed to the floor after about 1 1/2 years on subs. This lasted a very long time until finally he found a supplement called Nugenix. It's a Testosterone booster and it has been a life saver for us.
Hang in there, it does get better.