NSAIDs like ibuprofen or naproxen do have a chance of interaction with Cipro, so Tylenol would be a better pick for the pain assuming it works for you. The only difference between the potassiums is the amount of elemental potassium each one contains, you might also try a magnesium supplement as well. Hydration is definitely a good idea, Pedialyte or a half strength mix of Gatorade works well for that and might help with the cramps as well.

As for the infection itself I'm reluctant to guess without knowing more, but the duration of therapy for a major skin infection can be up to two weeks. Two days might not be enough time to see huge improvements.