Hi there, just hopping on here to be another pair of eyes and some encouragement. I agree with Bec that his daytime sleep is quite high for his age. At nearly 11 mo, the most my DS gets is about 3 hr.
I also agree that it's tough to break a sleep habit while teething. My DS got 6 teeth in the span of two months right after we had been on vacation. So, he was already a bit 'off', so to speak. Then, he learned to pull up to standing. I decided to give PD a try since he wasn't settling on his own and was waking frequently at night. There were many naps I spent 45-50 min of PD only to have him sleep 30 min.
And at night, I would do it for 45 min only to have him wake again 15 min later. It was so exhausting that I just went back to APing him, even though I still had to do it a few times a night. However, once his teeth were through, any time I've had to do PD, he is almost always back to sleep within 5-10 min and stays asleep.
I know it's not ideal to have to help him back to sleep so often, but there really may not be much you can do (after working on his daytime routine) to help him back to sleep quicker. Have you tried ibuprofen for the teething pain at all? Both my kids have been better helped by that than acetaminophen.
except that he now gets his bottle AND solid food together every 5 hours (per doctor)
What's the reasoning for this? Just wondering as some of this sounds like discomfort.
I'm also curious about this as a few times he's been unhappy it seems like he was hungry.
(((Hugs))), NW are tough. I lived much of what you're describing for a couple month, except for the long naps during the day.