I know where you're coming from. I lost my black lab to cancer last month and I have put myself into silly debt due to exhausting all options before having her put down. She had health problems most of her life so at ten years she left us due to mammary cancer. There is no panic like seeing them unwell as they are a part of you in every respect. When they leave the part of you that leaves with them will never come back and it's unquantifiable grief. It truly has no bottom. I hope you have many more years with your little man. Sending nothing but well wishes mate. As an aside, I recently found out you can contact your local RSPCA for help with costs if the PDSA can't help you. They keep a fund for pet owners in a tight spot and it's up to their area head if they do help but..... If it's a tight spot asking won't hurt. Best wishes and many blessings mate.