Week after Vacation Blues

I was starting to feel like maybe, just maybe I am starting to work to the standard my mgr needs. Then something happens and I think, okay did I miss the ball again? One of the mantras here and in my previous role is "balance getting on with it with getting it right. I feel like in my previous role there was more emphasis on getting on with it then getting it right (read perfect). And I am having a hard time with it. I don't know if it's just that I'm dumb from being overtired and physically weak and I'm missing things I might otherwise see. Or worse, maybe I'm just not cabable of seeing the things I am supposed to be able to see.

For example we have been having problems with one of our vendors because they are taking way to long to deliver on some things. So, we were told Dec 22 that all outstanding issues would be resolved by Jan 12th. Then yesterday we received an email saying that our rep would like to set up a meeting in the next two weeks to discuss the updates. My mgr expressed the concern that does that mean Jan 12th is no longer feasible? I emailed the rep and haven't heard back. In the mean time I asked if I should set up the meeting the rep suggested and was told yes. So I emailed the rep and asked what times the rep had available. The resposne was jan 23 after a certain time. So I booked the meeting. Then a couple of hours later I get a call from my mgr saying why is the meeting on Jan 23? I said, because that is the date I was given. Mgr says that is not good enough. Way too late. I said, well I still haven't heard back regarding Jan 12th. So I was told to cancel the meeting and mgr would call rep to try and get an earlier date I guess.

So my question is, is should I have anticipated that that would be too late? It's hard to book meetings with people as it is because they get booked up so far in advance. Should I have anticipated that Jan 23 was too far away and pushed for an earlier date? Maybe I should have because it was outside of the two weeks the rep originally suggested.

I think I am really trying, but I don't seem to be getting any farther ahead. and it really frightens me.