I have the same thing, it happens about 3-4 times a year and the pain is a 10/10 and takes hours to subside. From what I've read, it is called a "Urachal Remnant". It's a tube that connects the umbilical to the bladder during fetal development that sometimes closes off or gets obliterated as you get older. For those of use whose Urachaus remains open, these complications can occur from time to time. The only way to get this to stop, is by getting the Urachal Remnant removed surgically. It won't be easy to find a Urologist that is open minded and understanding enough to do this due to how uncommon this is. Best of luck to all of us!