Sir, you have to take him to a psychiatrist first. The level of depression will be assessed and then he will be asked to take medication or go for counseling or a combination of both
I suggest you don't delay the psychiatrist visit.
And if he refuses to come, there is no harm if you are stern with him and ensure that he comes
Health Tips
we can bring him out of this and set his life back on track. the only thing required is some patience and effort from your end, by taking medical help