Are you allergic to antibiotics?
Sounds like it's a combination of both the Bronchitis and the Antibiotics. One of the side effects of Antibiotics (other than the fact that they burn anything that gets in their way) is that they destroy bacteria that reside in your digestive track and assist in the digestive process.
I know that whenever I get sick, my entire digestive system starting from my mouth to my ... feels like it's completely whacked. If your symptoms cause you pain, you may want to contact your doctor, otherwise it seems like it may pass on it's own.
What type of antibiotic are you on?
This is your last day, right? Try to eat some yogurt. It helps to restore the helpful bacteria in the stomach. If your symptoms don't pass on their own, see a doctor.
Good luck and welcome to the community.