Underarm and chest pain with new doctor

I'm new to this forum and have a bit of a unique situation because I had a lumpectomy in March and radiation in April for DCIS. As I was finishing up my radiation, I was also being seen for chronic lower back pain and had bloodwork during that last week of treatments. To make an extremely long story short, I was sent results and a new cancer diagnosis that turned out to not be mine. They sent me someone else's results and after contacting the hospital, these mistakes, instead of stopping, have continued. Since the end of April, I've received multiple test results and been told I have both breast cancer on the left side and rectal cancer as well - but neither of those were correct. I'm currently still trying to get the person at the hospital who is in charge of compliance to get this fixed but am still dealing with both the stress and paperwork that has been ridiculous. I just received 2 more charges that my insurance paid for this other patient and am now trying to get that straightened out. With all that, I've had to switch doctors in the hopes that seeing a completely new provider might alleviate these continued mistakes. Now, I find myself seeing a completely new doctor for my follow up care that has never treated me and I'm not really comfortable that I'm going to receive the correct care. I'm currently having quite a bit of pain in my underarm and side of breast when I raise my arm or even touch that area - it feels like a deep bruise. I'm pretty sure it's been long enough and that this is too much pain to be surgically related. I don't really want to call this new doctor and hoped someone who's had this might know if this is normal pain or something I need to have looked at. I'm a teacher and worked in my classroom getting ready for the start of school last week and have barely been able to move for three days with my back pain and wondered if maybe I just hurt myself by doing too much.