I'd get along to A and E, PB. They'll scan you while you're there - guaranteed (they always have me when ive had cyst symptoms)! I know you don't want to ,but it's what we have to resort to nowadays!
I've had umpteen surgeries over the years, PB - ectopic pregnancy, cysts, fibroids etc. I had hysterectomy aged 36 for bulky fibroids but kept ovaries. Cysts were a regular thing for me so I had to be continually monitored but when this last one contained solid matter, my Gynae. said it was time to remove them as risk increases with age (but that's just my history - I'm sure you'll be ok). But please DO get along to A and E. Trust me - I've seen folk there with much more minor things than this and you're not making a fuss! xxxxx