I've been diagnosed with fibromyalgia, but more recently I have had a lump come up on my ankle. The GP said it's achillies tendonitis, and I've had a scan which confirmed this. My aches and pains, tenderness and tiredness have al increased over the last few months and I'm concerned. I used Dr Google before the scan and ended up seeing a diagram of a rheumatoid nodule on an ankle, exactly where my lumps are. Im wondering about ordering a crp test. Does this sound like it could be rheumatoid arthritis?