It’s not uncommon, so don’t worry. You’ve just exceeded what your system could handle and it’s gone into a bit of shutdown. 15 is A LOT, I generally recommend between 2 and 5 a day, and would set 10+ edges a day as a very short term challenge.
So just take a break for a day or two, you’ll find you reset how you feel and just chat to your bf about that not working for you and needing a lower level of edges. It’s all about exploring and learningwhat works for you guys, this is NOT a failure, just a discovery.
I’d add, if you’re that easily aroused you should try some no touch days, where you can either play with your breasts or nothing at all (strict no touch). I suspect you’ll find that just as exciting as doing lots (but again, just for a few days maximum or it gets boring)