If you mean rolled third eyeLID... then yes, I can relate. Again, with Connor. His right eye had cherry eye real bad. He went through surgery for that and it healed perfectly, looks gorgeous, no more problems.
His left eye is another story. First it had cherry eye. Then it healed by itself... then the third eyelid rolled out. Then one day it swelled up SO HUGE that it was covering at least half of his eye if not more. Took him to the same vet who did his first surgery, and doc told me Connor's third eylid was deformed, and it was not going back to normal on its own, and he could do a surgery on it that was not a typical cherry eye surgery. So we did that. It looked like it was going to heal up fine. Then it didn't, really.
Then we moved to GA, so I can't even take him back to the same vet. My next stop with him is an eye specialist, and I am currently saving up money for the next surgery. Some days his eye looks ok and some days (like today) it looks bad. A steroid helped him for a while. Now I give him something to fight infection. It is a constant stress for me! He seems not to be bothered by it, thank goodness! I am going to look for some pictures to show you. I'll be back.
Meanwhile, I am glad to hear Cosmo is home and safe!!