It may be worth referral to Rheumatology to test for Sjogren's Disease, formerly Sjogren's "Syndrome," if issues persist. PC Drs. will not usually think of that as a possible. It's one of the most common autoimmune diseases, is systemic and can affect any part of the body. Autonomic Nervous System Dysfunction, insufficiencies & other autoimmune disorders often co-occur with Sjogren's. After a decade of picking up multiple weird new symptoms & negative autoimmune antibody tests, lip biopsy confirmed it in my case. Sjogren's mimics many things, especially other autoimmune disorders. Sjogren's patients struggle with a multitude of cycling issues similar to yours for years before Drs. connect the dots & diagnosis. It's not only dry eye & dry mouth referred to as "sicca syndrome" as is still mistakenly thought of by some in the medical profession. Some people don't even have sicca, but many worse problems. Could be many things in your case. But that was my diagnosis & I noted the familiar experiences. Hope things improve for you soon. BTW, green tea causes me terrible headaches.