You poor girl - that sounds dreadful especially with a baby to take care of! IBS is a common "diagnosis" when they don't know the real cause of pelvic symptoms. Did you have a vaginal birth or a c-section? Did you have any other procedure at the time of birth (e.g., tubal ligation)?
If it truly all started shortly after giving birth, it would seem that it wouldn't be IBS or some other digestive type condition. With all the UTI's, you obviously have an infection and maybe it's more widespread in your pelvis. One possibility is PID (Pelvic Inflammatory Disease) but most PID is caused by STD's; however, there are other causes for it. Google it.
It's not unusual to have an abnormal pap smear for conditions other than pre-cancer. Harmless and common conditions (e.g. inflammation) can cause an abnormal pap so any abnormal pap should be repeated at least twice before undergoing any treatment. It's very possible that the infection is the cause of the abnormal pap so until your other symptoms resolve, it's very possible that your pap will be abnormal. Here's a link with info on paps -
http://www.cancer.gov/cancertopics/factsheet/detection/Pap-HPV-testing Also, pap smears are done to detect cervical cancer not ovarian cancer. Just thought I'd mention that since the title of your post is "ovarian cancer."
I don't think there's a WebMD expert here on the Ovarian Cancer Community so I suggest you copy and paste your post over on the WebMD Women's Health Community for Nurse Jane to reply. You may want to include "Jane" in your title so she readily sees it.
Hope you get some answers and relief soon!