Just thought I'd update.
The first day was last Thursday and it went really well. I ended up just letting him out of the car b/c it took so.long to get through the car line (over 40 minutes). I gave myself 45 minutes before I had to be at work and I was still late. It was crazy. He did fine though. And he did fine the next day.
Yesterday and today have been whole other stories, though. Dh took him yesterday since ds2 was sick and told me that he had kind of cried a bit but was ok.
Today, they made me go park my car b/c we couldn't get him to get out. Then he darted back and forth between us (while still in the car) to avoid getting out (all the while crying and screaming). Finally, one of the aides took him from me and he was screaming "mommy! mommy, no!". I was bawling by the time I got out of the parking lot. I think it traumatized me just as much as I'm sure it did him. And I have no idea how to deal with it. There was no compromise to be had with him, it didn't matter that I offered to come eat lunch with him or walk him to the door, he didn't want to go and that was that.
If it gets any worse I don't know that I can handle it.
We thought about putting him on the bus from now on, but I can see that situation repeating itself, just at the bus stop instead of in the car line.