About 2 months ago I had a sudden onset of really bad constant lightheadedness I went to se my ENT who said my neck muscles are completely tense so I had 6 physio sessions it helped me big time but now its back really badly. I am seeing my ENT again next week which I am happy about but last night was the worst when I moved it instantly make my lightheaded 100 times worse I know that coffee makes it worse I also have low blood pressure and PCOS so I am awaiting on blood test results to see if I am diabetic or low blood sugar. 

I keep feeling like very warm, sweaty, clammy and it gets worse ALWAYS after I eat I also have a history of having really bad anxiety which makes the whole situation worse and I try not to panic once the lightheaded sets in as it makes it 100 times worse.

What is wrong with me? PLEASE help I am really fed up of this and all my shoulder and neck muscles are very tense its driving me mad and I cant take much more of this