Laughing- You may well be right about the brain injury. Not only can it cause mood changes and depression, but up to 30% of traumatic brain injury patients develop deficiencies in one or more pituitary hormones. This has only recently been discovered so most doctors aren't looking for it. (Deficiencies can include loss of thyroid hormones, testosterone deficiency, adrenal hormone deficiencies, or growth hormone deficiency).
Since obviously YOU can't offer this info to him, I wonder if your son could present it to him? There was a good article about it in Scientific American Mind about a year ago.
I wonder if you could subpoena H's medical records if you get into a custody fight with him? Or request that he get a neuropsych evaluation?
