sorry don't know much about the beta blockers although I know there are many warnings out there about mixing beta blockers with certain medications. Hopefully, someone on this board will know.
As a former heroin addict, you must know you're on a slippery slope to use any opiates after recovering from the heroin addiction. I've tried to move to "less habit forming" opiates in the past, and for a period of time, I think I can do it, but it is a slippery slope. You have to decide what's best for you, however, and only you can do that. No judgement here!
Take care - keep posting with your questions - you'll find answers here and if I can find out anything about the beta blockers, I'll post back.
A friend, Jan