U must consult a psychiatrist for medicinal help.Then after he is calm down then consult with a psychologist for counselling sessions. For him institutional treatment is better ,try to consult psychiatrist in any hospital or nursing home not in private clinic.

Hello. I see that you are very concerned about him and want to help him. Among other factors sometimes seeking mental health services can be difficult considering our internalised stigma. Perhaps you could speak to him regarding what he can expect in therapy , offer to coordinate his appointment & accompany him to his session. Also, you could guide him to use telephonic counselling helplines like i-call to seek help. As much as you may be willing to help him, please be mindful of how this relationship is affecting you and engage in some self care if you find necessary.