I wish I had some magic words that would make things better. You have tried so hard and been such a wonderful mom to both Ally and Connor. It's such a shame that they can't get along. Don't feel guilty if you have to rehome Connor. You can't have them causing serious injuries to each other. I hope Ally is ok and maybe your vet can offer some advice. Maybe some meds for Connor or Ally. Something to calm them for awhile.
You are in my thoughts and prayers. I sure don't have much money but I would be willing to give what little I could if it would help Connor go to a good home. Best of luck to you.