I Get Pain Every Morning In The Area Of My

I get pain every morning in the area of my rectum and vagina. It goes away after standing up. I was seen by a doctor but I believe her diagnosis of acid stomach is incorrect. I can take a dental mirror and look down to see a protrusion in my vaginal area. It is soft not hard. It seems once I urinate in the morning when I'm waking up but go lay down again the pain gets pretty intense. Then I stand up and the pain stops. Then I can have a bowel movement. It seem that once my bladder is empty that relieves the pressure on my rectum. Any thoughts