Welcome to the forums. I'm really sad to hear that your son's been struggling a lot and that you feel like you can't deal with it right now. That sounds like a really terrifying situation to be in, and even though I've not been in that position before, I just wanted to let you know I'm here to talk if you'd like.
As Sophie mentioned, telephone counselling could be a good way to ease your son into seeking help, especially if he's expressed remorse about what he's done. Otherwise, it's probably also good to just make sure you and your kids still have a routine as much as possible. In stressful times like this, I have personally found that routine can be comforting.
Let us know how you are going when you feel up to it. We'll be here.