cortisol,ecg,chest xray,abdomen ultrasound,rft,lft,thyroid,cbc with esr, stool test,random sugar test.Everything was normal. I had this symptoms 3 months before suddenly. The symptoms went away in few days. Again after 20 days of the first bout, it started. Now, I don’t get severe lightheadness( not like room spinning) like the first time, but I do get them and specially during evening times. I have noticed that it gets better when applying ice pack on my neck.