I'm very curious to hear what type of cyst and what size. That will make a big difference in how it will be treated. Yes, I had all those pains and it can also be referred to other areas.
Unless she (the U/S person) has had a cyst herself, what does she know about the way they make a person feel.
I had all the symptoms you just described when I had a cyst with the possible exception of the nausea. Pain came and went, especially at night or after a bigger meal, and it traveled down the legs. When it hurt that bad, sleep was impossible until Ibuprofen dulled it for me and thankfully a small dosage was enough to work.
Cysts can press on the bowels so what she thinks is a bowel condition could easily still be the cyst. Unless you have other health conditions you didn't mention, the cyst could be the cause of all your misery. I know mine was.
Did the doctor talk with you at all or just the U/S person? Normally U/S results are sent to someone like a radiologist (first) to read it and then to the doctor to explain it to you. Normally you wait a few days to know the facts, including the measurements. Then hopefully you'll get some answers on how to treat it and get some relief.