Hello. I was diagnosed with POTS as Long COVID is attacking my autonomic nervous system and now have all the symptoms of Sjogren's Syndrome which apparently goes hand in hand with POTS. I also had an autoimmune disease pre-COVID. It has sometimes taken a while for the medical tests/bloodwork to show the issue for new health problems. I have had Long COVID for over 3 years and I still have new issues pop up. I have been doing research in regards to the autonomic nervous system. The Vagus Nerve - part of you autonomic nervous system - impacts your immune system. I have let my doctors run almost all medical tests they deem necessary so that I can hopefully know all the issues I have and find out how to live/deal with them. Good luck