Bandit's (my dog's) vet bill

My name is Alex and I have asperger's syndrome which means i struggle to make friends I also suffer from depression and anxiety.
In March 2018 my mum adopted a puppy from Cyprus so I could have a friend and something to help me leave the house .
I named him Bandit (my mum said it was love at first sight for her).
Three weeks ago we noticed that Bandit wasn't himself, in the space of a week we took Bandit  backwards and forwards to the vet where he stayed in twice overnight and he also had 3 seperate blood tests. However the vets' couldn't work out what was wrong with him.
Bandit then began to have seizures, the vets' were  concerned about Bandit's vision and reccomended that he had an MRI scan on his head. We did the MRI and it revealed a large mass on the left side of his brain. This is the worst news i've ever heard in my life, especially when I was told this could be a brain tumour.
Bandit was imediately started on medication to reduce the swelling of the mass and tablets to stop his seizures.
As it stands the specialists say the mass is either a tumour or an infection but without them taking a biopsy from his brain they will not know for sure. It is a costly and dangerous procedure to take a biopsy or reemove the mass. We have been told that prognosis is severe with expectancey of life of a few weeks to months.
My world has been shattered, my mum is so upset she cries all the time. I don't want to lose my best friend. Weare heartbroken. We are also in debt now, my mum has sold her car so we can have some money. We still owe the vet money and need money to pay the vet and buy his medication aswell as needing money for ongoing consultations.
So please could you spare a little to help us through this extremely difficult time. Thank-you.