So true. I had delta and it was as bad as influenza, and similar in the fever and malaise, but had a unique pattern. Most nasty viral infections come on fairly quickly and then gradually improve. I found covid snuck in over a few days and kept getting worse. Then of course the weird stuff- loss os smell, bloody noses, bad pneumonia after the fever subsided. Scary. My doctor said “You’re young and healthy; you’ll be OK” and I clung to that (even though I’m not that young— 47.)