Nassau one

Hi, first time on this message board but I am on a couple of other Healthboards. I finished treatment for lymphoma 11 months ago and gradually felt much better over the following months. However, recently, I have started feeling like I am coming down with something, although I have no fever. Very achy legs with pains in them sometimes. Aching painful arms at times and stiff and painful fingers. I can feel very tired very suddenly. My oncologist does not think it is related to the lymphoma so I am wondering if it could be a mild case of fibromyalgia. I can experience the symptoms for some hours and then I can suddenly feel fine again...and then, later or the next day, it comes back. Really weird! Many years ago, as a child, I had rheumatism. Does anyone here think this could be fibro, please?
Thanks!
Alison

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Husband dx July 2003, advanced rectal cancer stage 111C; myself dx July 2006 indolent lymphoma; husband dx February 2010, stage 2 prostate cancer.