Backstory - had 2 fillings done a month ago. The one done top left back of mouth has given me immense pain and trouble since when eating/drinking. Gone back today and filling is very close to the nerve. Was given 2 option, first being the best - to have my filling drilled out, medicine put into the tooth and a temp filling put on or 2 have antibiotics. That I will need a root canal following both of these. Went for option 1. They gave me as much anesthetic as I could have and still i could feel him drilling. I've ended up with antibiotics and have to go back for band 3 (£255 treatment) of a root canal and cap/cover. Absolutely gutted. I'm 30 and until last month I've only ever had 2 fillings. I cant afford that kind of treatment so it looks like now I'll be having my tooth removed so am absolutely gutted. 
Im also really cross because to me, this is as a result of the work he has done and so they should repair my tooth free!