For me pain is multidimensional, there’s different kinds of “worst.” The short drop onto a hospital bed after surgery was by far the strongest, sharpest, brightest pain I ever felt, but it only lasted a millisecond. Kidney stones can be sharp and radiating, but the pain tends to be localized with ebbs and flows. Pancreatitis was not as “sharp” as a kidney stone, but it was bigger, harder to tolerate, more attention consuming, and came with aweful nausea.

Aftermath of a seizure and car accident. First caused the second within seconds. The seizure pulled every muscle I had and some I didn't even know I had. The wreck caused a nasty concussion, messed up a vertebra in my back, and the resulting brain damage is still affecting me 6 years later.

I had a pulmonary embolism about 2 years ago, absolutely awful. The fun part was after I went home from the hospital and coughed up a blood clot.

Close tie between getting shot close range on my hand and my lower-back hernia that burst while I was doing a squat with weight on my back.

I think for me, the most painful experience is a tie -- one instance was Appendicitis (which was horrible) and the other instance was having one of our children without an epidural.

Worst instant of pain: root canal of infected tooth.

Worst overall: 6.5mm kidney stone.

Runner up: gall stone blocking duct.

I’ve lived a life mercifully free of pain, but one notable exception was after my weight loss surgery, when referred gas pain near my shoulder made it feel like someone was taking pruning shears to my clavicle. Once they figured out what was going on, some simethicone chased it away pretty quickly. I never would’ve guessed mere gas could hurt like that.

I relate to that, needles in the palate/gums is no fun...
My most painful experience though was when my kneecap dislocated and stuck to the side of my leg. Happened twice in my life. The first time when I was ice skating and the second just climbing stairs. Had to take an ambulance trip to the hospital :/

i occassionally get leg cramps that make it so i can't move, so it's impossible to stretch out my leg to stop the cramp

Same as you OP but, it was in my lady bits, not my mouth. Gotta love when glands don't function properly and decide to get blocked. I screamed so loud, the kid across the hall started crying.

ITT: People who have been in tremendous pain that also do not have a great understanding of human biology or medicine in general.

I had a pilonidal cyst that was pretty severe. I would feeder dream from the pain meds and pain about being shot in the head to end the pain.

I'm currently laid up in bed with some kind of sciatica thing. Not too bad when I'm lying down, but burning agony when I walk.

Still don't think it's the worst I've had, that would probably be when my gall bladder flared up. Couldn't inhale without stabbing pain in my side.

For me, it is a tie between two situations. First was worse pain, but for less time, second was slightly less pain but lasted more than a full day and was therefore a much worse experience.

The first was a very bad bout of PMDD that felt like someone running razor wire through the organs in my lower abdomen. I ended up curled on the bathroom floor, unable to move and vomiting from the pain.

The second was when I had an allergic reaction to a medication that felt as though I had bruised every bone in my body to the point that sitting, standing, or lying down caused severe pain from the pressure on my skin. I begged my husband to take me to an urgent care, even though the pandemic was in full swing, because I couldn't stand the pain anymore, even with an abnormally high pain tolerance.

I broke my leg when I was a kid. When my family was helping me to the car, I put weight on that broken leg out of instinct of... y'know, how I'd been walking up 'til that afternoon.

It was like a lightning bolt shot through my leg, mind-numbing amounts of pain.