Does anyone recognize these symptoms?

Hello I am a 30 year old female. I have been chasing down a chronic illness for 6 years, acutely for 2. I will have periods of intense flare ups where I will be symptomatic for a week or so straight and then periods of time where I will be relatively normal.
Symptoms are:
Nausea, tingling in hands/legs and/face, Occasional loss of use of hands and face, low BP, high BP, high heart rate that will wake me up at night, pounding heart rate I can visibly see in my abdomen, bloating, constipation, inability to eat, confusion about where I am, stomach cramps and grumbling, violent chills even when warm. At its worse I lose consciousness for a couple seconds. I have passed out a couple times.

I have been to my gp who did blood work, a cardiologist that did a full body vascular ultrasound and heart ct and heart monitor for a month, an immunologist who ran blood work to check hormones and autoimmune diseases, a neurologist who did a brain MRI and EEG, a gi specialist who has done an upper GI scope and an abdominal CT and colonoscopy and feces culture. The doctors except my gi doctor said nothing is wrong with me and told me to stop coming. I have no idea where to turn next. Does anyone have similar symptoms?