Hazel,If you have scratched your throat and nothing else is going on it should heal on it's own. Try not to eat foods that will irritate it more like chips, spicy foods, toast etc. Warm salt water gargles will help keep the scratch clean and I would stick to a soft diet for the next couple of days.
Off topic - I am the lady who chipped her front tooth biting a taco chip - Strange things happen to me too.
If you feel it is more than a minor scratch do check in with your Dr.
Be well,
Kitt