Hi Ryan, this does not necessarily surprise me. I am taking an opiate painkiller as well, I don't have any desire to drink. At the same time, I do not feel "high" taking the medication. I take as little as possible. I do worry about the future, but at the moment it does what it is supposed to do and that is manage the pain.
I will likely be completely off my medication in the next 2 months, and will post again when that time comes.