I was diagnosed with Chronic Idiopathic Urticaria a little while back. It's a histamine imbalance. It sounds similar to the article in that over a couple of day

I was diagnosed with Chronic Idiopathic Urticaria a little while back. It's a histamine imbalance. It sounds similar to the article in that over a couple of days I spontaneously broke out in incredibly itchy hives. The itching was incessant and lasted for months. Even with a diagnosis I found myself getting frustrated and despondent with living with it day to day. Thankfully medicine has answers for me; via constant doctors appointments and $1,000-per-session shots that mask the symptoms.