My cat, Otterpop, my best friend for the last 10 years is extremely sick and needs emergency vet care.

Based off his bloodwork from earlier this month, he's very anemic and his blood cell count isn't good. The vet I took him to a few weeks ago said he's looking more like cancer but he needs an ultrasound of his abdomen to figure out what exactly is going on. It could be cancer, kidney failure, or something else. I have been trying hard to work extra hours, donate plasma, cut costs where I can, etc to earn cash to get him seen so I can save my best friend but am still struggling to barely get by.. and now in the last two days his breaths are very short and rapid and he has a lot of fluid build up in his abdomen which is pretty serious. I need to get him seen asap to try save him or if it isn't possible, to end any suffering, but I do not have the means to do so and have no one I can go to for help. Please if you can kick down if you can donate anything, I'd be grateful beyond words. I just want to save my best friend. He's my whole world, my little shadow.. please help if you can