Female/15 So A Week Ago I Caught A Cold, I

Female/15

So a week ago I caught a cold, I had bad congestion, swollen tonsils and one plugged nose and was very tired. I stayed home and got rest and started to feel better, though after the other symptoms were relieved I have the sniffles still but my tonsils are red and swollen and the roof of my mouth is yellow and purple. Now a few days ago, when I checked my mouth, the back of my throat is red, very veiny and looks like its a bit a bumpy. I also have a swollen lymph node in my right armpit and its kind of sensitive and kind of hard and its hurts just a little bit if I touch it. I'm unsure what is wrong. Any ideas ? Or maybe I'm just overeacting ?