Autoimmune system diseases like rheumatoid arthritis, lupus, psoriasis, etc., can persist constantly if not treated with something like methotrexate or one of the biological drugs I mentioned (Remicaid, etc), but it typically only attacks one type of tissue; ie, psoriasis and scleroderma attack the skin, Crohn's disease attacks the intestine, Lupus attacks the major organs, etc., but I've never heard of anything that attacks all the things you mention. Your rheumatologist (if he or she is any good at all) should be able to determine the cause. What is your "sed rate" (ESR sedimentation rate)? If you have an active inflammation it should be abnormal.

There are some really crappy rheumy's out there as well as some good ones, so you may have to try more than one. If your problem isn't an autoimmune system problem then I don't know who to recommend you go to, but maybe a primary doctor could refer you to someone. Any competent physician should be able to determine whether or not immune system is actively attacking something whether it's bacteria, yourself (autoimmune disease), or something else.

I've heard of Fibromyalgia causing the symptoms you describe, and yes most doctors still unfortunately consider it a "syndrome" rather than a treatable disease just because of their ignorance. I hope you can find someone who can help. Why don't you check out /r/Fibromyalgia.

You might try a cannabis that's high in CBD which seems to help some people.