If I was in your place, I would do:
Disconnect all USB used as SR
Reinstall XCP-ng
if you have only a few VMs, my option would be just to redeploy XOA, REATTACH the SR (not create, REATTACH, be careful, a create will wipe your disk)
Recreate VMs, attach the VDI, boot from here
if you have to many VM, directly after deploying XOA restore your metadata backup, it should be repluging the SR and create PDB at least (but it's been a while since I didn't use the metadata)
In any case, backup everything, especially the VDI (.vhd). If you have the VDI, you can work around with the rest