Personally, toothache (constant background throb with searing white hot stabs that made me feel like I was being electrocuted in my skull every few seconds) gets the award for absolute worst ever. Two frozen shoulders, and adenomyosis that used to regularly have me puking and fainting and almost hallucinating on the bathroom floor are strong contenders - but miles behind. There is just something about vicious toothache that makes it the worst.
Contemplating this as just back from the dentist, where at least for now, things were ok this time 
What about you?