My poor cat has a bug on him, it's driving him mad :/?

if none of the products u r using that r bug repellent work, then just give your cat a thorough clean bath n concentrate more on the part where you've noticed the bug come out often! if the bathing does not help, take your cat to the vet but don't leave it there 4 a few days because the places where they keep the animals is very unhygienic!