OMGosh, that's tomorrow already! Yay!
Hopefully you get this in time to send someone to the store, or you've already got your bases covered... I recommend having some frozen peas on hand to use as ice packs. They're a more gentle cold, if that makes sense. Have all your prescriptions filled ahead of time. You won't feel like stopping at the pharmacy on your way home. And have some light, easy-to-digest foods in the house like jello, yogurt, scrambled eggs.
Be sure to keep up on your water. Antibiotics and painkillers both tend to slow down the digestive system and being all bloated and backed up is no fun. Have some mild laxative/stool softener on hand as well, just in case.
HTH!