Post Concussive Syndrome

I was in an car accident over two months ago and had a concussion. Since then, I still have no memory of pretty much anything other than high school and I am 38. I don't remember anything long term or short term. I'm confused all the time, my vision is still blurry, headaches and I'm really frustrated... You may tell me something 3 minutes ago and I will have forgotten a minute later.
What can I do to improve this condition? I just feel like I can't function anymore. I'm a teacher and my students are starting to be able to pull the wool over my eyes due to this!
How long could this last?
I was hit going 40 mph and the other driver never slowed down. My head broke the post between the passenger and the drivers side door. My head still has a bump on it as well.
If I am rambling, its also a new condition as is really poor grammar!It's like I am a different person!