Hi, I pushed through for several years, and still do. Just a big lunkhead I guess.
I try to gauge the benefit vs the drawbacks of any activity before pursuing. You will definitely need much more rest than before, think of your condition like a serious broken bone that may require multiple surgeries and therapy over a long period of time. We can accept something like that as burdensome but necessary, so we need to view our head injury the same.
All the advice about anxiety is great, STRESS is the #1 trigger to worsen my symptoms. Try to find relaxing things, try not to worry, see psychologist that specializes in brain injury.
You will survive, you will endure.