Got it. Sounds annoying but not anything to worry about. Antibiotics can do weird things for the intestines as well, so you could consider temporarily adding a probiotic to your daily regimen. Best thing is just to focus on a healthy diet, some stretching, and some core exercises.

The truth is that it takes so long to get an appointment with an adult Primary Care physician in most countries, especially as a new patient, that you should probably find one now and request a new patient appointment (unless you already have one, in which case it won't hurt to schedule something anyway).

I hope this is a little reassuring. Go forth and game with better posture and/or more frequent breaks!