Diagnosed with a 37cm ovarian cyst?

I have a 37cm benign cyst on my left ovary. Because of its mive size I look about 7 months pregnant. The doctor explained to me that because of its size my liver is encased in fluid and is not functioning. My surgery is scheduled for July 21 but that is almost a month away! I am now urinating blood and when I called the oncologist he said it was simply because my kidneys are tired since they are doing all my livers work, and not to worry. Should I really go another month without a functioning liver and some "tired" kidneys?? I guess since my oncologist isnt worried I shouldnt either, but this giant cyst wasnt discovered at my routine pap just last month so my faith in the medical is failing!