Occasional brief lightheaded/dizzy feeling
 

I'm very new to the forum so I apologize for the barrage of questions.

I began singing with a local cover band last year and I noticed that sometimes after singing a particularly powerful song or holding an extended note I'll feel very dizzy for about 5-10 seconds. Not sure if it is a hydro/shunt thing or just something unrelated.

Not sure but I think it would be unrelated unless your moving your neck in a wierd way while singing putting pressure on the valve for a moment