I am in the same situation, I had to have 3 very deep fillings right next to each other and am also looking for very strong pain killers. Have just bought some paramol (fingers crossed). I wasn't in any pain before the fillings but now the constant dull pain is really annoying, all of my research is suggesting Paramol or Nurofen plus are the best pain killers without prescription (opiate based so dont take them for to long you might get hooked) deep fillings affect the soft tissue at the centre of the tooth near the nerve and it is apparently perfectly normal to experience some horrible pain (sometimes for a number of weeks following multiple deep fillings like this) my dentist has said if the pain persists after another two weeks, he will take some more x rays (just in case) Good Luck, it's absolutely horrible, but you are not alone, and your teeth should be much happier in the future.