Cat and ongoing issues - help needed.

Cats are cheap as shit, throw it away and get a kitten.

What he has sounds almost like what I have. It has something to do with the ears. I go in November to an ear nose and throat specialist. I have had it ever since I was 12 so over 30 years and finally I get to go to a specialist. If his lymph nodes are swelling then he most likely can't eat when they are swollen and yes it effects the sinuses as well. I sometimes can't eat for a week to a time due to the swelling and they are saying it all revolves around the ear. Which I have ear infections in non stop.

Have them do a check on the ears it could be that doing the whole issue. My cat is 15 years old and now going on 16 in December, so I know what it is like when you have an elderly cat.