his lymph nodes are swollen. We taken him to vet and they dont know what there talking about. He keeps itchting his chin and is loosing hair. we have been washing him every day for the past 3 days and it is getting worse. His behavior has been the same. He is 4 months old and we have another cat that is 18 months. The new cat has been getting into plants but there not poisonous. What do you think he has?