Cat eating less than normal.

My cat Noir hasn't been feeling well for about 5 days now. He is a 3 year old, black, altered, male. He isn't overweight. He has a history of FLUTD but since I found his triggers, 8 months ago, he hasn't had a single episode. He eats canned and raw food, no dry. He is allowed outside for a few hours a day and is inside the rest of the time. He hunts in the barn and eats his kills. We allow no poison on the property.

Behaviorly he is normally an active cat who will purr if you even look at him. He's loving, and periodically hops up in my lap for petting.
His symptoms are:
Excessive sleeping.
Eating way less than normal.
Not interacting like normal. Doesn't want petting.
Isn't purring.

I've tempted him with his very favorite foods and over the past few days he has eaten less and less each day. This morning he only ate a tablespoon of gravy from his wet food.

He is visiting the litterbox, grooming himself, and when he is awake he walks normally with his tail held high. His eyes are clear, bright and the third eyelid is not showing. He jumps up on the furniture with no obvious pain or instability. His gums are black so I can't check them for color. But his tongue is a normal pink. He allows me to feel him all over and palipate his abdoman with no indications of discomfort. He's ok with being picked up. I've observed that his urination is normal. I haven't observed him passing a stool yet but he isn't straining at all. He may well have as we are a multi-cat household and I can't tell whose it is once it is buried in the litterbox.

The first day I noticed him feeling bad he was holding his ears back, shaking his head and gently scratching at his ears. I administered Mometamax from a previous Rx and within a day he was much better in that respect. I have continued with one drop per day and his ears seem fine at this point.

He had his vaccinations 3 weeks ago and didn't feel well for several days but then seemed normal.

I am at a complete loss as to what to do. As long as he was eating I was willing to adopt a wait and see attitude. But as he is now refusing his favorite foods I feel I need to be doing more.

Thank you for your time. I was afraid that was the case as he is normally the picture of health.

I was hoping to get out of a vet visit as he doesn't travel well and is absolutely terrified of any vet. The stress of a visit can bring on a FLUTD episode.

I will call first thing tomorrow and get him in asap. In the meantime I'll keep trying to get food into him.

MaryAnne