The only thing you can do to prevent concussions is to reduce your risk of head impacts. Your brain will be more sensitive to impacts after the concussions you have already suffered.

An alternative to Prozac that might work is L-Tryptophan. You could take 200 mgs in the am, mid-day and before bed. It is a substance your body understands. I weaned off Paxil after 14 years and replaced it with L-Tryptophan last spring. Just took my before bed dose. Amazon has the best price. I use Source Naturals from Amazon. You could also add L-Theanine. It helps GABA stay balanced. I was doing great with the L-Tryptophan until I was subjected to some intensely stressful and traumatic situations last August.

You asked about chiropractic and massage. What symptoms were you hoping they would help ?