I don't understand how this happened at all. Everything was fine yesterday, we were walking with my…

I don't understand how this happened at all. Everything was fine yesterday, we were walking with my son and there were no signs. But by night, my nasopharynx started hurting, everything is dripping down my throat. My nose is fine, but it feels like it's pricking all over the sides, where my tonsils are. I really hate it when it's in my nasopharynx. Today I woke up with a slight ache, my head feels foggy, and my ears are stuffy, like I'm in a vacuum. I don't feel like myself... I'll be lying down all day 😔😔😔