Breast cancer - achy joints and painful surgery sites

Hello everyone  

I was diagnosed July 2019 with primary breast cancer after my 1st Mammogram and have had 6 cycles of Chemotherapy followed by surgery then radio. It is now 8 months since my very successful lumpectomy and sentinel node removal and 5 months since the end of my radiotherapy and I have been experiencing continued discomfort with the effected breast and pain under my arm where the nodes were removed. I can only describe the feeling like being bruised and almost like a friction burning sensation.  I even find wearing my bra irritates the areas especially under the arm.  

I am still getting Herceptin injections 3 weekly, bone strengthening 6 monthly and Letrazole for 10 years and I am now experiencing painful joints, flushes(which are easing) and stiffness in my hands especially when I first get up or have been idle for any length of time.  I was always pretty active and I am only 53 and find this hard but once up and moving it does get better. Any advise would be very welcome, I know I am one of the lucky ones and don't like to complain.