Tsk! I'm sure if he had a cold you wouldn't be extra glad to be on a date somewhere else since THEY wouldn't have a red nose, so don't even put any energy into those thoughts!
Sorry about the being sick on top of stress, is there anyway you could have a preemptive talk with C about Molly via email BEFORE he gets there so you don't feel the compulsion to talk about it face to face & sick when you're thinking you wont have an easy time with it?
I hope you recover quickly.
Happiness will never come to those who fail to appreciate what they already have.