E.M.
First of all, I am so sorry that you are going through all of this. I wish you health and happiness, and I hope you get better.
My suggestion is seeing someone professionally. I think it will be worth it, and it will benefit everyone in the family. Another idea is maybe introduce your son to journaling. Sometimes it's easier to write down those feelings, instead of speaking them. It can be something private for him, or if he wants to share the journal he can, but I wouldn't force him to share it.