Oops! you must have missed reading the thread from MY terrible weekend when I re read all the old emails. EECCHH! There is nothing to be gained but more heartache. But that's the past. Leave it buried there.
YOU. Whether you believe it or not, you are a strong, capable individual and manageing the finances is one way to convince yourself of just that. My friend says I can squeeze a penny til it screams. Slight exageration, but I am thrifty. You learn to be. And it gives you a powerful sense of fulfillment when you do it. Even if you are in the red now, working through this and digging yourself out is another step towards realizing your own worth. I'm certainly not Donald Trump, but I'll be glad to help you sort through any quagmire your XH left you in. There are probably others here even better than me.
Your son is going through his own personal He11 right now, and you can't guide him through. You can suggest, of course. You can ask that he be more considerate of the position you yourself are in. You can seek help from others in your community that can give guidance. People that he respects. How about his Coach? He's probably aware of the sitch, but doesn't want to intrude, and if you asked, would be more than happy to give a little extra guidance. All without your son knowing you asked, of course. And besides, some pushing of the boundaries at his age is unfortunately perfectly normal, just bad timing.
Irish, you are a wonderful, loving, trusting person who got shafted. We all did to some extent or the other. But that doesn't define who you are, UNLESS YOU LET IT. Get out there, wave and smile at neighbors, work in your yard. Be the happy, friendly person you are inside. I can't tell you what you find as a purpose; you have to find that for yourself, but you can and will find it.