Vet treatment

My one year old cat, Fifty recently was neutered. Unfortunately, he had a bad reaction to the process and is now unable to use her back legs. It is possibly due to a blood clot. He is finding it hard to eat and drink and really needs to be on a drip in a vets while investigations are carried out. Any one who is willing to help with his treatment costs would be so gratefully received. An MRI would reveal if a blood clot is the cause but this costs between £2000 and £3000. I want to do everything possible for this little chap to regain his happy and active life. thank you for reading