Help with Rex Vet Bills

Really don't want to do this but here we are..

Everyone meet rex,

Rex is a Romanian rescue who we have had for 3 years in January, he's a spirited loving dude who's always chasing and annoying his brother, loves to chase birds, cuddles and squeaky toys.

On the night of 29th rex had a toilet accident downstairs which is unlike him, later in the morning he's got a slight limp and reluctant to move which we thought was his glands as this happened previously, several hours later hes lost complete use of his back legs and unable to lie down or move around freely, when he's tried to move he's trying to use his front paws to drag himself around.

Having taken him to the vets, they suspect he's got a slipped disc which has caused complete paralysis of his hind legs and took him straight away for xrays, and the cost of that is £400 alone.

With the cost of living and myself on maternity leave after giving birth nearly 5 months ago, money is a big struggle which is why I'm resorting to this, even £1 would make a difference, I'm not above begging in this situation, he's my fur baby and I would do anything at this point to help him, I have put 2000 as a estimate after xrays, treatment ect, any left over will be donated to the PDSA or the blue Cross

Please help any way you can

Thank you