APS is associated with autoimmune disorders frequently although it may occur on its own. I would highly recommend you get tested for autoimmune disorders, particularly lupus, which can be done by your PCP (basic screening tests) or more in depth by a rheumatologist. AI disorders often cause rather vague symptoms that are hard to pin down. If you’re male, Drs are less likely to look for these as AI problems are much more common in females. I would ask your PCP to do some screening tests and/or refer you to a rheumatologist.