Good Morning,
What you are describing that he is experiencing is anxiety and panic attacks. In addition, extreme stress can trigger not only these but also depression (his sleeping too much is one of the signs/there are other symptoms)
If there is a doctor that can see him and prescribe anti anxiety medication and possibly an anti depressant, that would be helpful as a start. Any physician can prescribe these medications although a psychiatrist is a better choice.
If you feel that he may try to hurt himself, then he will definitely have to be evaluated at the hospital to determine if he is safe.
You could offer going with him to the doctor's office for support. If possible, try to discourage him from drinking alcohol as that is a depressant.
Licensed Psychotherapist
Licensed Psychotherapist, Certified Hypnotherapist, Self-Help books author