Ugh, I'm so sorry to hear how you're feeling. First off, drink lots of liquids and get some rest.
I agree with what the others have said and as the sole person in my cakery, I've been where you've been. What I did at the time was sit across the room and instruct my man-friend on how to complete the cake. I figured he's watched me make over 700 cakes, he HAD to have learned something. Luckily it was only 2 small birthday cakes he had to finish and not some crazy intricate wedding cake. After that HORRIBLE night, he suggested I reach out to other cakers in the area who are in similar situations (of being the sole caker) and set up contacts in case this happens again. That way I could have a back and also be a back up to someone else. In the process, I ended up hearing about my local ICES chapter and I've made some great relationships since. We oftentimes post on facebook if someone needs a last minute cake made for whatever reason and it's been a great resource to have.
Plus, my man-friend is REALLY happy he doesn't have to put an apron on again.
Good luck with this weekend and I hope you feel better soon!