six year recovering breast cancer patient with soreness

Hello,
Welcome to ehealthforum,
If mammogram has come back negative, you can consider requesting for tumor marker test and PET scan to rule out secondaries (that might not be picked by mammogram). Breast tissue is also known to respond to hormonal changes in your body, hence if there have been fluctuations in hormonal levels, you can experience breast pain (due to swelling up of breast tissue). Consider going ahead with getting thorough examination done by your doctor/gynecologist to rule out chances of musculoskeletal origin of pain. Look out for any changes in skin over breast, nipple changes, presence of lumps etc. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.

I have an appointment with my oncologist next month and I will discuss the symtoms with him.

I also have an appointment with my primary care physician next month. He has been treating me for shingles. The pain seems to originate in my back so I think it might be associated with shingles.