If you can afford the tests, get these ones done:

IGF-1
TSH (thyroid stimulating hormone)
FT4 (free T-4)
FT3 (Free T-3
RT3 (reverse T-3)

24 hour saliva cortisol test (he probably won't know what this is, but just tell him that cortisol is di-urinal meaning it follows a 24 hour pattern and you need to see what yours is doing throughout the day).

Sex hormones
Vit D
Metabolic Panel including B12

If he gives you and grief about this, tell him that the current research is focusing on damage to the pituitary gland resulting from trauma and that a lot of doctors are having success treating TBI patients with hormone replacement therapy who are deficient.

Here is a good article you could bring into him to read: http://www.worldhealth.net/pdf/Gordon_Thera10.pdf