I've been under the weather now for 10 days. It was terrible then got better but just before I felt completely well it's come back. Just like when I had Covid. The headache paracetamol doesn't touch the cough. The throat pain. The temperature. The skin ache. The extraordinary fatigue. What is this ? I've never had this level of fatigue, this sort of persistent headache or this weird boomerang illness other than Covid.