First off, take a breath. I know it’s a very hard time, but it also important to keep yourself sane.
I would start by finding someone who really knows what they are talking about. This could be someone from his yeshiva, it could be someone like R’ Horowitz, anyone from Our Place or Madraigos. You are not alone and there is help available.
Finally, daven, daven and daven. Love him unconditionally. Good luck.