My cat wont eat anything and hardley has the will to do much anymore He is young about 3-4 years old and hes gotten awfully skinny over the months also What should i do?

you should try giving him some milk or yogurt if he doesnt eat it just rub it around his mouth eventually he will lick it sounds like to me he might have worms along with some stomach problams .if it worsens you should take him to a vet tell me when he gets better.