wtf is this. D:

I have a marble size bump, a hard bump, in my jaw under my chin. It's really freaking me out. It started hurting very suddenly and it's been swelling for the past hour (when I touched it and first noticed that it hurt). It sort of hurts to swallow and it really hurts to touch it and flex my neck. I have no idea what it is, James says it's possible that I have a swollen or infected lymph node. He says if it's swollen, it should be gone by tomorrow morning, but if it's infected, I have to get it checked out and get antibiotics. I have no idea what to do because it's just started hurting progressively more... Gah I'm so worried. It's almost 10 PM though so I can't go to just any clinic and get it checked out, I'd have to go to the ER, and I really don't think it warrants that. I'm just freaking out uggh. D: