Hi fluentinsarcasm
Welcome to NeuroTalk

.
My general suggestion is that you could encourage your boyfriend to give up activities which put him at risk of concussion - the brain damage from concussion is cumulative.
A retired football player here, with a long history of sport-related concussion, has been prescribed Aricept which he says has helped him. This is an option which your boyfriend could discuss with his health care team.
I hope that the referral to a concussion clinic will help him.
All the best.