My cat has fleas is lathargic hasn't been eating much and is constipated

I went to the animal emergency clinic about 2 months ago it cost is $2,000 so if you can get into the Vet such as Petco PetSmart Western pet clinic that's where I go that's my favorite try to go there but if it's an emergency and nothing else is open then if you love the cat and you're scared for its life take it there they did save my dog however you have to have the money up front

David is your cat kept indoors or is it a free range kitty? Johnson and Johnson baby shampoo for the fleas and a vet visit asap for the lethargy and potty problems could be feline Leukemia or fiv