I understand why it might seem odd that low blood sugar would be an issue when he's never had a problem before (and it may not be) but it's such a common problem in these small dogs that it's always in my mind as a possible reason for lethargy and/or balance issues and/ or shivering.
I don't think he's faking it if that's what you're implying:)
But I do think there are a few possible explanations for his behavior which range from the innocuous to perhaps something more serious... especially if we can rule out hypoglycemia
1. As strange as it sounds, I have seen some dogs with anal glands behave as you describe especially since he was licking/sniffing his anal area. If you are not familiar with these glands, this LINK discusses them in detail.
Some dogs are extremely bothered when these glands fill up which causes pressure on their bodies and will continue to do so until they are emptied. Although a groomer can provide this service for you, they usually attempt to empty the glands externally. The better method is done rectally which is how a vet tech or your vet would empty them.
Many of these dogs are reluctant to jump, they hold their bodies in an awkward way (trying to minimize pressure on their bodies), and frequently will hold their tails down. When the tail is up, more pressure is exerted.
2. Problems with the spine as you suggested, especially given his breed. He's a little on the young side for Intervertebral Disc Disease but it's still possible, I suppose.
3. He could be running a fever. If you manage to get your hands on a thermometer, normal is between 100 and 102.5. Of course, then we'd have to wonder about the source of the elevated temperature....bacterial or viral infections or tick diseases are possibilities.
If he's not responding to the honey in about 10-15 minutes, then hypoglycemia isn't likely to be the problem. In the absence of a thorough physical exam or a rectal, he could be given Aspirin which could help with inflammation, pain and a fever.
The dose would be 82 mg (low dose) twice a day, with food to avoid stomach upset. My only hesitation about its use would be that it might interfere with what your vet would want to prescribe if he has to be seen. But several doses should be fine.
If he continues to behave this way or worsens, then a vet visit might be prudent. Deb