I too wonder if every ache or pain is cancer returning. I think this is normal for us to think this. I am having achy breasts, pain in the groin, back aches etc.etc.
i requested a PET scan and recieved from my oncology Dr. I also got a private Breast Thermography done the day before the PET scan. This was done through a private clinic and not covered by any insurance. This was all done almost 3 months post "last day of radiation" treatment. I wanted facts not just someone telling me don't worry, we will test you in X months. I find if you don't ask for it you don't get it.
the breast thermography told me I have cystic breasts and has given me a baseline to which I can compare future tests against as to what is normal for me. I ask for a hard copy of all my reports so I can review and/or share with other doctors for a professional opinion. It gives me history going forward.
The PET scan confirmed that there was no cancer spread anywhere, confirming the diagnosis of cystic breasts AND that all my aches to date are probably a result from my cancer treatment and/or normal aging. I'm 56. Anyway the PET scan gave me a baseline as to what pains and aches are not cancer. So far it appears all of them. This is data that I feel gives me comfort and destresses me. I recommend you get as much scientific data, testing as you need to give you comfort and don't stop until you do.
All the best for you. You are not alone. I also fear every pain but evidence showing me that it is not cancer gives me peace of mind.
i had 5 chemos and 28 rads which ended in February 2015.