I'm so sorry you're going through this, Jonathan. I just wanted to second what Rob said: Your kids need you. I know everything seems so hopeless right now (your world's just been turned upside down), but you need to focus on yourself. Allow yourself time to grieve, but take hold of the little things that bring you joy — whether that's reading a book, watching a mindless comedy, or spending time with your children. Seeing a therapist might help...I think talking through the pain helps...even just typing things out helps me. Some therapists will do sessions over Skype even (I have no experience with this, personally, but maybe someone here does). All is not lost.
Hang in there,
J