I seemed to slip backwards for quite sometime before I started to improve. I don't know why. Perhaps it was continued brain swelling? Maybe I was pushing too hard?

If you are up to it (see above reference to pushing to hard), perhaps you're ready for more cognitive therapy. I can't remember, have you had a neuropsych to help pinpoint your deficits?

There are a number of options. In my case, I found that Attention Processing Training (APT) helped.