Not really TMI, but I didn't know where else to post this. So for the past 3 days, I've had sore throat, but more in the tonsil area instead if my whole throat. Headache, fatigue, fever, and stuffy nose. And swollen lymph nodes in my neck. The headaches have subsided, but my throat still hurts and my nose is still stuffy. But for some reason, along with all of this, my entire neck and part of my scalp is super sore and stiff. What is causing this?