Hello MsPaige! Welcome to SR!!!
You have found a wonderful place with a lot of understanding people. I'm so sorry to hear about your situation.
Please make yourself comfortable, read around the boards for a while, and know that you are with people who completely understand.
If you truly feel that the young man will harm himself, then it would be best to call an ambulance and have him treated right away. Professional hands are the best place for him. Plus, if he is just threatening suicide as a way to get sympathy so that you will let him return, he will not try that manipulation again once an ambulance has been called.
Please take very good care of yourself and your precious child! Hugs, HG