I had extreme pain in my upper left tooth pre molar I think that wouldn't go away so I went to the emergency dental hospital in the uk, they started off the root canal procedure and I felt fine after, the dentist used the cleaning liquid and then killed the nerve and put in a temporary filling. He told me to go to my regular dentist 2 weeks later to finish of the root canal process, when I went to my regular dentist I was completely fine for most of it until he started drilling a bit and then put in 3 injections (he used the injection but it was not a needle) of the cleaning liquid im not sure if it was bleach as I never asked. As soon as he did that I got extreme burning sensation on the left side of my head above my ear, and suddenly I could feel and taste the liquid he used in my throat and it burnt, and my nose and left eye started running. I had to sit up for a bit, but I carried on 3 mins later and got the root canal finished, the dentist cut around my tooth to prepare for the crown and he put a temporary filling around my tooth. When I went home that night the burning headache never went, and I started to feel ill, I started spitting out loads of liquid from my mouth that tasted like the solution he used, it took 1 day for symptoms to settle down but ever since then I have been getting a runny yellow nose in the left nostril only when I bend over and my nose feels weird and brown when I breath in through it. I have also started to get tingling sensations in my left cheekbone and some burning but not that often, it has been 6 days since the root canal and I have a dentist appointment in 3 days to put the crown on. � what should I be doing, I have seen the doctor and he was not to concerned, would this heal up by itself, or do I need medication or even surgery, I was not given any antibiotics or any medicine by the dentist.