I’m a 20 year old male. I exercise frequently and have no health problems that I know of. (other then mild insomnia for which I occasionally take ambien)

My problem is that if I watch any significant amount of television (15 minutes or more) or use the computer or any electronic type screen I start to become very dizzy and disoriented. I also get irritable and short tempered. Things that make me calm down and become clearheaded are reading or exercising. This has been going on for several years but has gotten worse. Sexual activity also creates a similar feelings of irritability and whatnot. If I am tired when using the computer/TV ect the dizziness comes on quicker and more severely.

Does anyone have an idea why this happens?

Thanks Much