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Can a simple ovarian cyst turn into a complex ovarian cyst almost 3x the size within a matter of 2 months?

I went to a new gynecologist in December 08 due to about 5 months of continual symptoms dealing with the pelvic area pain and nausea. I told the doctor that i believed i had a cyst. The sonogram he requested for me revealed a 2x4cm SIMPLE cyst. He did not tell me cause did not think it was important to tell me being it was "only" a simple cyst. I happened to find out while i was reading the report myself. This gynecologist did tell me i had gallstones and i should get in touch with my primary care doctor, which the report also revealed. All the doctors i saw and no one attributed the symptoms to anything but possibly and most likely the gallstones. I had the surgery a month later to take the Gallstones out because i was advised that it would more than likely relieve me of my nausea and pain. 3 weeks after this easy surgery i was vomiting nonstop and back in the hospital in pain, severe nausea and severely dehydrated. They released me after the moment they got the new sonogram report stating i now had a 8x5.6cm COMPLEX ovarian mass on my ovary. I was referred to immediately consult a gynecologist/oncologist. I was told by the oncologist that it needs to be removed and they will not know if it is cancer until they get to it. He was surprised the General surgeon did not see the mass while having the surgery. Then he said that the General surgeon said there was too much scarring in the pelvic area to see it, because of a past surgery. I have all the symptoms that say ovarian cancer. Is it possible that this cyst changed so drastically in such a short time? Is it also possible that the Gall bladder surgery put more stress on my immune system and possibly made it grow more rapidly? Especially if it IS cancer? Or is there a mistake done in the first ultrasound that did not find the solid features of the cyst? And why would a gynecologist think that they can decide what is important to tell me and what isn't? How could he think that it would be unimportant to tell me i had a cyst? By the way that previous surgery was due to a radical hysterectomy from cervical cancer 12 years ago. The ovaries were left in. With so many symptoms that reflect ovarian cancer at this point what are the chances that it is not cancer?