stress definately played a huge part in making things worse for me - if i had a stressful day it even bled more too. I can understand it would make spasms worse because stress makes muscles clench up.
I'm glad you got an appointment quickly, if he gives you any of the creams they take at least a week to kick in.
In the meantime changing your diet ,gradually upping the fibre and taking lots of baths should help a bit until wednesday. Sitting on a hot water bottle helps too!