[SamiNFurbabies]

The pottying is part of his separation anxiety but I do not know how to break it because if he's in the crate he poops if he's out of the crate he poops.

I'll come back to this thread later---I really need to get to studying...however...
Maybe he just doesn't like where you are keeping him during the day... I mean...maybe it's an excitable place.
I keep Izze in my bedroom---where she is familiar... it's quiet and dark. It does help that she has a friend, but I wouldn't suggest one to you because you can't add another when you aren't committed to this one.
Walking is different from playing in the yard...I would start walking him before you leave to tire him out...so he won't be anxious...as someone said.
Also---Please reconsider and get the thought of rehoming him out of your head. Be resolute and committed to making this work out---put in the hard work and effort. If you do that... you'll have the best friend for life.