What Causes Pressure On The Upper Abdomen With Breathing Problem?

Hi, I am a 48 yr old woman. (145 lbs) Since Sept./11, I have been feeling upper abdominal pressure and some breathlessness. I've had many tests done to determine what the cause may be. Last week I had an ultrasound done which determined a 4.6 cm cyst on the left ovary. The result also read "There is a complex left ovarian cyst not present in 2009. Some of the septations are thick, irregular and demonstrate vascularity. Gynecology consultation is recommended, as an ovarian neoplasm cannot be excluded". My doctor sent me for the CA125 test and she called and said it came back very good. She is referring me to the gynocologist. I am probably reading too much on the internet, but I am really concerned. This anxiety and stress is certainly not helping the stomach pressure. Can you help shed some light on my situation?