Not strep throat, stressing out

Excuse how disgusting my mouth looks, So Monday night my tonsils felt sore but I thought nothing of it and this morning when I woke up I was like damn I have a sore throat both my tonsils were hella swollen it felt werid to swallow and I had my mom look at my throat she said it was red and when I was trying to take pictures I got this glimps of white crap and i was like "oh great I have strep throat" so I went into my local clinc and they tested me and it came out negitive for strep and I'm kinda freaking out because it's pretty nasty! And I'm just wondering have any of you ladies had this before?