I have had Sjögren's plus Sleraderma and I just keep sipping water all day and when I wake up in the night as well.. My mouth stays so dry if not.. I'm sorry your son has that. I have Raynouds disease as well. Small blood vessel disease and have had several small ischemic strokes because of it. So many problems.. I have lower BP and always have. I take a statin to help not have clots to block small blood vessels in my brain. I also have antiphospholipid syndrome and it's a blood clotting issue in my blood another autoimmune disease. Having Connective Tissue Disease is quite terrible as there's no cure for any of them.. Good luck all!!