OK, I hope I don't jinx us, but I think we're done with it.
I took Luke to daycare this morning. He was in a better mood. Hadn't pooped this morning yet, but his diaper was wet, so he's not dehydrated and he had a lot more energy. I told them to call me if he had diarrhea again, Jack will go pick him up. So things are looking better in our household and I'm at work. yea! Thank you everyone for the well wishes. They must have worked.