In addition to resting, get your doctor to prescribe the following hormone tests. If he words it as a possible pituitary dysfunction caused my trauma, your insurance company should pay for them (of course, make sure to check with them before ordering the tests). You may want to run a google search on "hormones, brain injury" before you go into your doctor so that you can provide him/her support on why you want these tests done. It is estimated that 30-40% of TBI patients have hormone complications. Here are the tests:

IGF-1
Testosterone
Estrogen
Progesterone
TSH
FT3
FT4

Also, make sure you google what the optimal ranges are for your age and sex. Most doctors today still rely on the antiquated reference ranges set by the FDA when dinosaurs roamed the earth.

And, of course, I always recommend getting on some type of rehabilitation program if you can afford it. LENS neurofeedback is a good one among others.