I got a sudden, ungodly pain in my side one day in 2015. It was completely out of the blue. It took the ER 6 hours to find the cyst but then I was referred to a surgeon. He wanted to wait until after the holidays to remove my spleen (it was around December 12th at this point) but something in my gut told me that wasn't a good idea. I asked him to take it out sooner. About 5 days later they told me that the cyst was bigger than they originally thought and was the size of a softball.
Then after surgery, the surgeon came in and told me, "It's a good thing we took it out when we did. If that cyst had burst, you would have died."
This happened only a few years ago, but it will stick with me until I'm gone. Always trust your gut.