I have always had normal periods, until now. Over the past four months, my cycle has been off. I first spotted between periods, the next month all was fine, following month I spotted for about 4 days (went to the doctor and she said it was probably stress), when I was suppose to start again I had no period, but did have sharp pains in my pelvis that would shoot down into my vagina and rectum making it hard to even sit or stant (that lasted for two days, off and on about 30 sec. to 1 min. each time). I started my period 8 days late. Now, last week I noticed I could feel my labia and inner vagina were engorged/swollen but not red or hot. So, I went to the doctor again. She said it was normal, but there was some increased discharge. She said it looked fine under the microscope, but gave me an antibiotic for vaginitis. Now, I can feel hard knots/lumps (3) on the posterior wall of my vagina. They are about the size of a pencil eraser. If I push on them, they are not painful, but does make me feel as if I need to poop. What is this?