How do I treat this? He's had treatment from the vets 3 weeks ago I don't think it's worked. I've found some on him and it's making me feel physically sick. He goes out all day and comes home when he likes so I can't keep him in all the time. But I just don't know what to do. I'm cleaning 24.7 never seen one outside of his body but I'm worried. I love him to bits but I can't deal with fleas. Help please