Some quick thoughts. Feel free to probe me for more detailed info.

1) For headaches, dizzyness and noise sensitivity, consider finding a chiropractor trained in atlas vertebra realignment. Preferably find one who does x-rays before and after. This is the crux of the spinal cord and can pull on the brain stem.

2) For sleep, consider addressing adrenal gland fatigue. This involves dietary protocols and supplements.

Also for sleep, consider strict sleep hygiene habits. An excellent resource with online guidance and interaction is Dr Jacobs' CBT-i 5 week program.

3) I highly recommend the supplement program Mark has created in the 'stickies' section of this form.

4) Your car ride and video game issues sound like visual vestibular mismatch. This is a vestibular disease that can be easily missed with basic testing.

Good luck,

Hains