Hello,
Has your doctor done tests to see if it is definitely a kidney infection? when I had one, I was sooo wiped out, I could only lie in a bed for two weeks - literally, it was awful. I was peeing massive blood clots and blood - it was horrendous. I took some whacking great antibiotics and they cleared it up quickly - within a week. Usually what they will do is give you one 'general, kills most bacteria' antibiotic while they plate your sample up and see which specific ones work. Side effects are sooo uncommon - you'll usually know by now if you are allergic to antibiotics!

Hope you feel better soon
Seeker