I didn't progress to pneumonia but I had a high fever for four days, boy did I sweat, and horrible gastrointestinal issues at both ends. One afternoon I collapsed on the bathroom floor. I had a ferocious headache that took months to fade after I'd recovered from the fever. I didn't know what I'd had until a blood test weeks later showed up Q Fever (Coxiella) antibodies. Just before I'd caught it the farmer next door to us had allowed me to help myself to his dung heap (horses and cows) for my veg garden. I'm pretty sure it was the dust from that that infected me.