Have your thyroid checked out. You might also want to see a cardiologist. What meds are you on? Do you take any hypertension meds? Over medicating those can cause hypotension (low BP). ER is not the place to go and your ER missed one of the most obvious things.....BP. Did they take it?
Hope you get answers soon and feel better.
MCTD (SLE Lupus, polymyositis, scleroderma). Diagnosed 2005. Kidney, liver, GI tract, dysphagia, raynauds, barretts esophagus, quadriplegic in 2005. Recovered and now active in downhill skiing, golf, hiking. Meds: amlodipine, benezapril, omeprazole, potassium, folic acid, vitamins, maxide.
Remain Optimistic and you can overcome.