Complex cysts anyone?

I went to my GYN because of a really bad pain I had a day after having sex. Worst pain I ever had btw and it turns out it’s a complex cyst that never bursted which now I’m scared if it bursts that pain will be unbearable 😣 anyways does it go away on its own or do they have to remove it? I’m scheduled for another sonogram next week to get a better look at it so I don’t know much except my gyn told me to go to the ER if the pain comes again