I trained my brain using Lumosity games sent to my email address. They are so much fun, you guys should check out the company...Lumosity. It trains your brain with these fun (well, I think they're fun) games...to increase your memory, and help with focus, concentration...all these things I know we all suffer from lack of in the throes of PTSD.
It doesn't cost very much per month, although they don't tell you when you pay that you must pay for the whole years subscription (or in my case 2 years, as I thought I was getting a better deal)...but still, it's worth it. I can feel it helping my brain every day. They keep it light and stimulating enough to benefit from...and it's FUN!