YABU for not using a proper thread title! I hate it when people just put "AIBU" in AIBU! I feel tricked.
Your DH is unreasonable, but just make sure he knows you're genuine so he doesn't think you're trying to get out of your date. Just rearrange. "I am ill today, let's book a table for Saturday instead."
If that doesn't sort him, he is a sulky pain in the bum