The free fluid is probably not related to the urination frequency at night. 1 - 2 times at night is normal, 4 is excessive. One possibility is a bladder infection which can be diagnosed with a urine culture. The other possibility for your pain and urinary frequency is active abdominal and/or pelvic muscle trigger points, which can also causer pain with intercourse and urinary frequency. Many women have fould collecting in the pelvis after ovulation. Also a 2 cm cyst is considered normal size and should not be the cause of your painful symptoms. Once your genecologist can rule out cervical, bladder, and pelvic infections, consider an evaluation by a qualified pelvic floor physical therapist.
Dr. Hoyte
I would guess that your pain is from the ovarian cyst. I had one on each of the ovaries and I had alot of pain associated with it. I would either go back to the doctor and ask a few more questions, have them run a few more tests, maybe an internal ultrasound...... or go get a 2nd opinion. Seems to me that your doctor should be doing a bit more testing if your in that much pain.