I've got a gecko that is very very sick. He's about 8 years old, refusing food and water, and will spit up any medicine or food that I try to force feed him. I called around and discovered that to euthanize a gecko it costs 40 dollars to 80 dollars! I can't spend that much money, I've been trying to get my snake Shilo parasite free and that's costed me over 200 as is.

He won't stay on his heating pad and every time I pick him up he's freezing. It's almost like he's trying to die. I'm so upset I can't stop crying, I don't want him to die but what do I do? I don't want him to starve himself to death, he's so thin and I can't do anything about it!
The doctor we used to take him too said he couldn't do anything but euthanize him for 50$.He's had eye infections almost all his life and is blind, he gets large cysts on his head and neck and has had surgery about 3 times in his life.

Just today I tried to force feed him some mealworms and I cut them up into mash and tried to syringe-feed them down his throat, then I chased it down with some water. He ended up spitting it up all over me.

Again his vet said the only thing we could do is euthanize him, but I can't pay 50$ to kill my baby...
Is there a way that he can die gently without hurting him? Or should I just let nature take its course?