Hey Travis - I definitely know about the post-op anxiety and tiredness. That's pretty common, and not surprising considering what we've been through. Give your body some time to recover. You're right that very soon you will be riding your bike and being active again.
I've also had antibiotics make a mess of my digestive system. If the yorgurt doesn't quite work, you may want to look into a product called "Bio-K". My gastroenterologist recommended it when antibiotics messed me up. It's a probiotic and it'll be in the refrigerated areas of a grocery store or a drug store. I'm in Canada, so I don't know how easy it is to find in where you are. Here's a link to the product info, in case it comes in handy:
https://www.biokplus.com/en-ca/homeHang in there! Soon all this will be a distant memory!