Just got out of Mercy E.R.    

For last few months been waking up shaky.  Last night woke up lightheaded, freezing cold, sweating, and shivering uncontrollably. I called 911 took ambulance to ER.  They said blood sugar is normal. They said its not Covid and that blood and urine were normal. During the visit these symptoms happened to me a 2nd time.  They have no diagnosis but i'm medically cleared to return home.