I've had good results with the M1 Micropulse PEMF device the last 2.5 weeks - I've been able to run and my brain fog has cleared up.

Since I have the coils and an old iPod, I downloaded frequencies from this site (1st link below) and am trying it out tonight.

The coils are about $25.

I'll post my results in a few weeks, but I figured I would share since it is inexpensive.

Do It Yourself Pulsed Electromagnetic Field | Build your own PEMF device, possibly for free

Concussion and Traumatic Brain Injury (TBI) - DrPawluk.com