I'm a 40yr old male and in the past 1-2 years I've been having more regular migraine type headaches. More recently I've developed this subtle headache accompanied by achy joints, nausea and tiredness. I went to have it checked out and they diagnosed me with Rheumatoid Arthritis. (AMA positive and Rheumatoid Factor of 29) I just made an appointment with a Rheumatologist, but I'm super scared.
I've been married for 13 years and had unprotected sex
This is where the problem actually starts from, you are "thinking". Don't guess, you need to know. HIV can't be guessed from symptoms and moreover, your symptoms are too unspecific to HIV. Indeed, you have put your self in to risk by unprotected sex with multiple partners. However, as my friend above has already told you that it's a good sign that your wife has tested negative. So, go out there, get that test and "Know" it instead of "Guessing" it. At this point any test including rapid is good to determine, just take one.
You should be tested to rule it out, but the symptoms you have could be attributed to any number of diseases. If you are still in contact with your other partners, you should also ask them if/when they were last tested for HIV.