I was diagnosed with POTS a few years ago. I always had low BP and ate alot of salt, which helped. 2 months ago i had sinus surgery and had bad reaction waking up..cold, teeth chattering, neck and spine pain..also, since this time my BP is high (140/90) without any changes to my diet or meds. Im also sweating, dizzy and i think it set me into huge POTS flare? anyone experience this?