As GlassHead has pointed out - the recently diagnosed thyroid issue was probably caused by the concussion you sustained.

I've read about this issue... I think a lot of information can be found if you google, "brain injury thyroid", "brain injury pituitary gland", etc.

I am sorry to say that it probably means your journey back to wellness will be arduous. The thyroid has a lot to do with a person's energy levels.

http://www.braininjuryrx.com/2009/th...gland-and-tbi/