I doubt if the two are related, but do you know what antibiotic they gave? A lot of us are very wary of the shots because the one vets seem to like to give the most is called Convenia and not only is it NOT recommended for oral infections (it's meant for skin infections) but it also is VERY long acting and stays in the body up to 65 days. If your cat has a reaction to it, there's nothing you can do to counter-act it. You might want to read up on it on
this page from Dr. Lisa's website
I don't see any 94 at +6 ....but I would recommend getting some more tests especially a "before bed" on the PM cycle....most cats go lower at night, and without that testing, there's no way to know if he might be going lower at night and then bouncing during the day.
You might want to think about changing your shot schedule some more. Although I don't know your schedule or your life, waiting to shoot until midnight every night could mean being up ALL night testing if he should drop too low. When we first started, I was shooting at 11am/11pm because I HATE mornings....after a few nights being up all night and testing until 5-6am, I decided it was worth getting out of bed early so I could always get at least a +2 on the AM cycle before I had to leave and it was easy for me to stay up and get a +6 at night to make sure China would be safe for me to sleep from midnight-6am. I still hate getting up at 6am to shoot, but I can usually go right back to sleep if I want to too. Matter of fact I think most mornings I never
fully wake up to shoot....LOL
China just had her 3rd dental and she's 15....getting rid of any rotten teeth and getting Mister's mouth cleaned up could very well help with his numbers and possibly even end up reducing his dose. Infection, inflammation and pain can all cause the numbers to be a lot higher