The link below I had put up in a previous post when I first come to the realisation of where I was at
Yes it does have a driving me nutty effect and although it has settled to what it was, no longer constant just occasional, it is real. I have remedial massage, lymphatic drainage massage as I find it helps, especially with the annoying sternum pain which @zoffiel mentioned in what she has experienced
https://www.cancer.org/treatment/treatments-and-side-effects/physical-side-effects/pain/post-mastectomy-pain-syndrome.html