I would be more concerned with the mental capabilities than the physical and competitive abilities, etc. You can live a long and fruitful life with physical limitations. Cognitive problems can be very disabling.

We need a bit of background before we can direct you.

What was your condition immediately after the head impact?

A day later?

A week later?

What diagnostics have been done?

What treatment/therapy/drugs have been prescribed?

Can you be a bit more specific about your current symptoms?

What symptoms did you have that have gone away?

What kind of lifestyle do you live?
Sleep
work schedule
work type
environment.. loud, chaotic,
habits/hobbies

Does this dizziness exist at all times?
lying down, sitting

visual jumpiness?? What do you mean?

Have you been examined by a ophthalmologist (Eye M.D.)?
Ear Nose Throat Doctor?
Neurologist?
Neuropsychiatrist?
Psychiatrist?

Has anybody mentioned or tested you for Nystagmus?

If you can't visually focus on anything, how do you make a living and get around?