So I've been having headaches and toothache for a couple of weeks, I thought nothing of it until I ran out of painkillers, at which point I decided to go to the dentist. She told me I had one hell of a deep cavity and that it should be filled straight away, to which I agreed. So then she asked me whether I wanted anaesthetic or not, which I declined because I was pushed for time (you have to wait a while having been anaesthetised before the filling can occur). What a stupid decision, it was the most excruciating pain I've ever experienced and the pain is now twice as worse as it was before I went to the dentist. FML.
inb4TL;DR : sore tooth --> dentist --> filling w/o anaesthetic --> headaches4dayz