FD is definitely frustrating. I completely understand where you're coming from. My buddy Lou was diagnosed 3 weeks before my husband and I got married. We spent the night in a hotel to be close to family, yet I was up early to T/F/S, and I didn't drink much during the reception so I could take care of his shot that evening. We haven't taken a honeymoon yet, and we took our first trip with him last summer. We'll try a repeat this year. We're also well acquainted with high numbers. Lou's an IAA kitty so we've certainly had quite a few high BGs. It does get easier, especially when you find a good dose. We haven't found a backup to help out yet, but I know some vet techs are willing to help on their downside. I hope you can figure something out so you can travel without too much worry.
I'm sure he's feeling gross right now because of the high numbers. The weakness could certainly be neuropathy. I know many people give B12 (Zobaline) to help with the neuropathy. I think it's something like
THIS, but there is info on the website in the
Health Links/FAQ thread that you can review. Many hugs Shelly.

