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I am sorry about your husband.
most like it is not the testosterone which is causing the irrational behavior
most likely it is the alcohol drinking and marijuana use and possibly other drug use.
he needs to see a doctor and get on a treatment plan to stop his alcohol use or else he will not get better.
FSH should be high if his testosterone levels are low.
the pituitary gland is trying to get his testicles to make more testosterone.