Light and noise hypersensitivity?

Hi, I have a 12 year old son who is a good honor roll student; however, suffers from severe daily headaches. We have had an MRI, countless neurologists and doctor visits along with eye apts. he was finally diagnosed with Irlen syndrome, a visual perceptual disorder where the brain has problems processing light information. He gets severe car sickness, cannot watch television for more than 5 min without getting a headache and is sensitive to white paper and fluorescent lights. His tinted gasses have helped slightly in school but television and car rides are still difficult. It's like all stationary things are moving so moving objects are obviously that much harder to process for him.
In addition, he cannot stand the sound of regular pencils on paper and requires mechanical ones. He will even hand out mechanical ones in school to peers sitting next to him. He gets an upset stomach from loud bass noises such as fireworks, loud music, crying. Etc. it sounds like he has sensory processing issues, any ideas. Pls help!