Im not on the meds you are on but I have had some really horrific nightmares. One was so bad that I was terrified of going to sleep.

Sometimes this can be a sign of low O2 stats whilst you sleep. My nightmares corresponded with a time that I would wake up literally gasping for breath at night. It seemed every time I dropped off I would suddenly sit bolt upright and it seemed like an age before I could get my breath.

Have you checked out the side effects of your drugs on the internet? I know beta blockers can give people nightmares.

Its such a shame you get rid of the pain and then you get nightmares. I hope you get it sorted.

Love
Rach