I’ve had ongoing post mastectomy pain since my bilateral mastectomy in 2016. I have found that gabapentin is helpful for the nerve pain and I’ve also had massage therapy for the scar tissue problems. Also stretching exercises like free style swimming are helpful. It is better but I still have pain. I think it’s something that some of us have to learn to live with. I’m happy to be living, even with some pain!! Hope you feel better soon!