I was also very active before the accident I was in and now I'm still debilitated almost 3 years and 8 mos from the accident...
Luckily, I was finally diagnosed with having hormonal imbalance that was caused by the concussion. I'm receiving hormone replacement therapy, HRT, and I'm getting better.
Although I'm significantly better than I was before I started the HRT, I'm beginning to realize that I probably won't even be 100% again. At this point, that's ok with me, as long as I still get better than I am!
I have been receiving the help of a very understanding and supportive therapist.
This is a very difficult journey for those of us that have to endure it.
It's natural to become blue about having a sudden degradation in functioning and to mourn for the loss. A good therapist can help you through the tough times.
Hang in there.