Welcome to HCM
We understand your concerns
From the description you state, the problem definitely could be anxiety
about his health conditions. Is he recently under any stress? Any recent treatment for some unknown medical conditions? Happen to see some unnatural bereavement? any other happenings which could have hampered his peace? Find out and take him to a good psychologist
for counseling and psychotherapy
. I can help you if you are interested. God bless you.