Dear T,
Feeling anxious that you haven't replied. You always reply by this time, unless maybe you're out of town. If you'd rather talk about it tomorrow, just reply and say that. I'm just concerned you're either trying to figure out how to say something you know I'll find hurtful or you're annoyed/frustrated by my email. Or that something bad happened to you.

More realistic: You had something going on fairly early this morning and haven't had a chance to respond. Or you somehow missed seeing my email.

I should have just waited until session, I guess.
Love,
LT