I'm glad that summer does seem like it will bring you a little relief. I feel the same way about reduced pressure.
It's clear that your STBX is not going to come through himself. What if you asked him to pay for help? I'm not sure what you need, kid assistance, cleaning, packing boxes, lifting things. But there's someone out there willing to do it all for a fee. Drag out that checkbook and give yourself a break.
In any case, I'm thinking about you, and I know you are strong enough to get through it. It's OK to vent, we're here for you in that way. I wish I was close enough to actually help you!