He really needs to get into treatment. I have a TBI and it is not fun to live with. Mood swings, forgetfulness and feelings of impending doom. One period of time I'm on top of the world, the next I'm having a crisis for a few days.
My wife has lived with me this way for 35 years. I have control over it without meds and have done quite well.

I don't know if it is related to tthe TBI but, I refuse to take meds. I use meditation, exersize and health diet. I avoid refinded sugar, artifical anything, preservatives, trans fats and MSG. Most of the time I feel good and when I feel a turn coming on I use the meditation and distraction methods.

Good luck with your husband and know that you are in my prayers.

Eric