Google for it and then book an appointment with your local Gum clinic.
They will say you can attend a drop-in session but my experience of that was I sat there all morning being the only guy in there feeling awkward as hell due to that than being told "sorry, drop-in is now closed, come back tomorrow or book an appointment"
But your Gum will tell you for definite.
But if you have chills, you could have just caught a regular cold or flu from anyone - or even the girl. Last year I quite literally walked to town, walked into a CEX for 5mins and walked home and then developed the worst case of tonsillitis ever. So that is how easy it is to catch something from anyone.
Or as you are fearing you could have caught any type of infection.
The gum clinic is the only ones who can help other than guesswork