My cat from the past few days is sick I don't know why. He's resisting to eat food and it causes him to weaken. I don't know what to do I don't have enough money to bring him to the doctor.

We can't tell you how to treat your cat; how old is your cat? If you want to stop worrying about your cat you will have to find money to take it to the vet.

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I agree, your cat needs to see a vet. Call around and see if any vets in your area offer payment plans or if there are any agencies that offer help in cases like yours. Perhaps a family mamber or friend could help you out, in any event if your cat is not eating then it is in his best interest to find out why.