New exercise or meds causing swollen feet, legs, face?

I would definately see your doc... when i first read this i thought your kidney function may be decreased which can be because of the diabetes.... the other thing they can and should check for is any heart conditions (i.e. any sort of heart failure). you didnt mention what you were on the antibiotic for.... also if you are retaining fluid and you have a decreased kidney function salt could cause your heart to beat faster. Your body is still absorbing the sodium. Your heart works on a sodium potium pump, so increase levels of electrolytes or minerals could cause this symptom. I would see your doc!