I too am in the slow lane. I also tend to "over react" to my own health when I am tired, stressed, run down, or dont feel good.

You had a course of antibiotics? Then you may have an over growth of bad bacteria in your gut, and 70% of our immune systems come from our gut. Eat yogurt (or take the acidopholus pills) get some probiotics going to re balance your gut. Yogurt (non fruited) can be rubbed on your bum to help that diaper rash, but the unbalanced bacteria could explain why it was so severe for you.

I hope you are feeling chipper in no time.