For what it's worth, my wife has tested positive for covid twice—once before the vaccine was invented, once after. The first time I had it too, and it felt way worse than a cold. Mostly I remember the fever and whole-body soreness that felt like I had been working out every muscle in my body. After getting the vaccine, my wife tested positive after a coworker came down with it. My wife was entirely asymptomatic, and I didn't catch it from her at all despite her quarantining across the hall from me.
Now, this isn't a 100% scientific study because, among other things, they were different strains (alpha vs. omicron). But it was sufficient evidence for us to keep up with our boosters as recommended.
Anyway, although covid sucked and I don't want to get it again, it wasn't the worst pain I ever experienced. (Or even the worst illness—I think that was having strep.)