I used to dream I couldn’t breathe and someone was sitting on my chest. I used to make squealing noises which really freaked my teenage son out. But I couldn’t speak so that was the only noise I could make. Mine were to do with my painkillers my GP called them night terrors. I think I was on morphine slow release at the time but don’t quote me on that as I have been on so many. Talk to your doc. As your dreams are about pain it may be your subconscious dreaming about what is on your mind. We all suffer from sleep problems so anything on top of this like nightmares needs to be sorted to give yourself the best chance at a good day. Best of luck x