Looking for pain relief strategies prior to TRSR

I injured my shoulder Dec 2025, but was not able to convince my doc to do an MRI until Mar 2026. I have 2 fully torn muscles, 2 partially torn muscles, spurs, bursitis and severe arthritis in my right shoulder. I was hoping to have surgery quickly, but a recent cardiac ablation requires that I not be off blood thinners at all until May 28, So, I am scheduled for TRSR on June 1. In the meantime, my shoulder pain is getting more difficult to ignore and seriously interfering with my sleep. I suspect that my prehab exercises are also an aggravating factor. What are some strategies I can use to help relieve the pain, especially at night?