Save Elvis

For the last week Elvis has started exhibiting strange behaviors. Walking backwards, refusing to walk at all, only turning left. Yesterday (Friday) I took him to see our vet. She did a check up and a blood panel and everything showed him to be perfectly healthy. The recommendation short term was to watch and see if issues increased or decreased being that some conditions causing these symptoms go away on their own.
In less than 24 hours this has turn into a nightmare. Mike and I came home to find Elvis standing in front of the door esentially screaming. We rushed him to the ER and have been told the most likely scenario is a brain tumor. They need to do an MRI to verify but won't be able to do that until Monday. We have brought Elvis home and he is currently next to me on the bed snoring.
To be bluno, we're poor. A few hundred dollars is something we can scrape together but not thousands. Elvis means more to us than life and we will do anything to help him. I know it's a lot of money but if anyone can help us, help Elvis, please do. Elvis is a great little man. Please help.