I've raised £500 to Fund Joey’s vet bill

Please help my furry idiot!!
On Saturday 14th October i woke at 7am to find Joey with all his skin and fur on the left hand side of his body missing.
My poor baby had skinned himself somehow. I rushed him to the emergency vet and he‘s now been in the vets for 7 days.
He had to be sewn up using the loose skin from his tummy meaning his nipples are now on his side and there was a 3cm area the skin wouldn’t reach that is still an open wound until the skin starts to re-grow. He has to be sedated every other day to have his full body bandage changed, he’s on pain relief and antibiotics.
Joey is insured but only up to £4000 and the vet said the treatment will exceed this. The current spend is £2900 and he will require treatment for at least another couple of weeks and potentially a second operation.
Any money left from the donations will be given to a cat charity.