symptoms?

I am 39 years old.  For the last few months I have been experiencing stomach problems.  I burp, have gas, and my stomach seems bloated.  I feel sick to my stomach a lot.  Since Christmas Day, I have been feeling yucky constantly, and I started taking Zantac every day.  I saw my family dr. on Monday and he gave me Prevecid.  It has helped a little more than the Zantac.  I also have been having problems with frequent urination in the last few weeks.  My periods have been anywhere from 23 to 30 days apart and some times are very light and short (3-4 days) and sometimes very heavy and long (6-7 days).  My pubic area seems bloated to me now also.  I sometimes bleed just slightly after sex and I have some real sharp pains in my pelvic floor and rectum occasionally.  I have lost my appetite since Christmas Day when I started feeling so sick.  I looked up my symptoms and discovered ovarian cancer and have been unable to think of anything else since that time.  I see my ob/gyn next Tuesday but I seem to be worrying a lot.  Can anyone help me?  Thank you.