You will get better.
You did too much after your concussion because you didn't get the help and advice you needed.....me too. Not really knowing what was wrong with me, I tried to push through the weird feelings by doing things I would normally do but it all just kept getting worse.

You won't lose it. I felt like I was losing it a few times but you don't, the fact that you feel like you might means you are still sane.

There are a lot of people who understand how you feel, if it helps try and get in touch with some over the net. But don't spend too much time on the computer cos it puts a strain on your brain which is trying to get back to normal.