Eat my swimming shorts, Cyanea Capillata

In all my years of spending increasingly long slices of time in the sea, I have never had a bad jellyfish experience. I get stung every year, but it's usually the nettle-like sensation on the arm or leg (once on the mouth, which was less funny). It burns for a bit, sometimes it oozes a little and within 30 minutes at most it's forgotten. 
Yesterday was a different story. I was doing my Forty Foot - yellow buoy - yellow buoy - Forty Foot swim when I swam through a shaggin Lion's Mane, about half way between the two yellow buoys. And boy was it different this time. 
It was a big fucker as I felt it on both my arms at the same time (from wrist to shoulder), then the neck, torso and all the way down my legs to my feet. There was no point trying to do a U turn, I literally swam through it. The only silver lining is that I wasn't swimming the crawl or my face would have got the Lion's Mane treatment too. 
After years of deriding them, I think I might join Pepe and the ranks of the other jellyfish haters/fearers... 
It started as a tingly-burny feeling while in the water, then burny-burny in growing intensity for about 1.5 hour (thank fuck I didn't get it on my face), then tingly-burny for the rest of the night. On and off. I felt like a Christmas tree garland of pain. 
I hope it will be another six years before I encounter another of these fuckers.
Pardon my French...