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Hi Joe. A high RF (rheumatoid factor) is a marker for rheumatoid arthritis, an autoimmune condition that can lead to painful, stiff joints and fatigue, as well as skin, bowel, nerve, lung and heart complications. If your test result was equivocal, it should be followed up with an ESR, CRP (both screening tests for inflammatory conditions in the blood) as well as anti-cyclic citrulinated peptide (anti-CCP) antibodies.
This condition, or a related autoimmune condition, can be quite stressful to have as the symptoms are very distressing and the diagnosis is often delayed. This stress can, in turn, make the symptoms worse, particularly if it is interfering with your sleep and throwing off your mental balance.
I would suggest that, in addition to the above tests, you ask your doctor for a referral to a rheumatologist. They are the experts at diagnosing and treating autoimmune and autoinflammatory conditions. There are some extremely effective medications available now to get these kinds of symptoms under control.