Cyst??

What does an ovarian cyst feel like. I've had one in the past, with no pain. Last night I experienced horrific pains that were closer to the right side, with no bleeding and I'm thinking cyst. I'm on cd 24 (no opks this month) and I'm assuming it's a cyst as that would also explain the abundance of EWCM ( both of which are produced by high estrogen levels). So ladies who've experienced cysts in the past, what do they feel like?