Computer screens can be brutal. Working with a smaller screen may help by reducing the amount of your field of vision that is a computer screen.

I encourage you to read the Vitamins sticky. A multi-vitamin is likely just a bit better than nothing with some vitamins. Fish does not provide nearly enough Omega 3, especially if you are not eating cold water fish. A supplement would be good. The injured brain needs far more than the usual dietary amounts.

A opto visit may be worthwhile, especially if you look for an opto who understands eye strain after suffering a concussion. You could inquire with a question such as " I suffered a concussion and get head aches and am concerned that they may be vision oriented. Does the opto have experience with this ?" You could also look for a behavioral opto.