Okay, today Yafe seemed calm and docile and is still flicking his tongue. However, he is popping a little bit and when I took him out for a quick once over, he did a few muscle "squeezes" on my arm when he had, what appeared to be, a particularly uncomfortable, pop/clearing out of gunk.
He is resting comfortably in his tank now and his head is level and not up or elevated. Good signs.
The vet said he can have symptoms for a while after the bacteria is gone and not to worry over minor symptoms unless things really regress and for a while. She doesn't want to introduce anymore antibiotics right now anyway.
I was planning to offer food again tomorrow (5 days from last feed, a 9G hopper - a very small meal for him). However, I've decided food is good and can only give him strength. So I am offering a, still, small meal, tonight, but not as small. I normal meal for him is a 15G or so weaned mouse. I will offer a 12G or so hopper tonight and see if he takes it. I do not plan on feeding every 4 days normally, but these are extenuating circumstances. Food = nourishment and strength and can only help him get better. I also don't want to risk symptoms getting worse before he gets more nutrients and strength and potentially does not eat again.
I'll keep everyone posted. I am very optimistic he will eat tonight.