I had this too, with prevT, two years ago. She had a vacation of about 2,5 weeks, but I didn't saw her for 4 whole weeks. And it was a hard time for me. Not just because she went on vacation, but having no one to talk about my stuff maked it that more difficult.
I was also a bit angry at her, because I had no back-up or something. I think she thinks a little bit too easy about this sort of things, like it's not that of a big deal for clients. I've never said this to her.
She also hadn't told me this that long it advance. Maybe a few weeks before her break?
An other time when she had one week off, she told me the week before that week. I think that's just too short notice. Especially because I was really not doing well, then it just causes a sort of shock.

But back then, after I had a session after several weeks of not seeing her, it just felt normal a few minutes into the session.
But last year, I didn't saw her for more than 5 months and it felt weird. And it was still like that at the 4the session.