This seems nuts to me as well. I don't think it's aimed at you personally (if that helps) - but I can't figure out why on earth he'd ASK you if you want another session, knowing you could full-well say "yes", and THEN essentially tell you that he can't schedule another session due to his open-ended vacation. It seems to me that it would be a bit kinder to anticipate that you might say yes, and maybe mention the vacation before asking you about scheduling something else.

But even putting that aside, this open ended vacation thing sounds wonky to me. I absolutely get that some people have the freedom to do that, but I don't think it's professional for a therapist to just leave without giving any indication of when they're coming back - geez, how does that not activate abandonment issues for even relatively "normal" healthy folks?!!

If he is having a medical issue (himself or his family), he needs to be a bit more transparent about that, because it changes the interpretation. He doesn't need to provide full details, but the situation would be different if he said, "I'm so sorry, a close family member is having some health problems and they need my help. I plan to be with them for at least two weeks, but I might need to be away longer, depending on how things progress. So, I'm not able to schedule additional appointments right now, though I'd be happy to call you when I'm back at work to set something up." Not hard.

The thing that would really confuse me is that he didn't seem to give any indication of how much variability there could be in his schedule... does he plan to go for 2 weeks, but may stay an extra day or two? Or is this something where he might be gone for months? Without some indication, you can't really guess... and that's sort of unfair on his part.

I'd find it very stressful and annoying. Was this your first visit with him? If you're not already connected to him, I'd probably find someone else, honestly. I'd worry that this might indicate that he doesn't really pay attention to details well, or consider his patients' needs, and I'd want someone a bit more... grounded and organized, someone that I felt I could count on, I guess. I also, if I'm being honest, wouldn't want to reward him (by continuing to be a paying client) for what seems like irresponsible professional behavior.

Good luck!