My cat won't eat for days

Hello, first, I want to tell you the chronology. So, my cat is sick. The night before he got sick, he was still fine, still playing happily too. The next morning when I wanted to feed him he didn't want to. Then when I carried him to feed him, I saw some dirty fluid from his ear. I thought it was an ear infection so I dropped it with dropped medicine. But, for 3 days, now the cat still doesn't want to eat. The ear is still leaking a little fluid. Then, this morning I looked for him but he wasn't around the house, it turned out he was stuck in a dry gutter. Because he hadn't eaten for days, he had no energy, so he couldn't climb up by himself. Maybe he had been in the gutter all night. Then I carried him, I moved him to where he usually sleeps. After I put him down, suddenly he seemed like he was going to vomit but there was nothing in it. His voice was "grook grook" and it lasted quite a while. About 1 minute. After I approached him, his mouth smelled like a corpse and the lower part of his mouth was dirty. I want to take him to the vet but there are no vets in my area. I'm confused about what's wrong with my cat and what should I do? Please help and advise. For information, my cat is a stray cat that often comes to my house to ask for food. So I never let the cat into the house at night. I'm worried that it will defecate carelessly while I'm sleeping. So I don't know what happened at the night before he got sick.