Pain during intercourse and throughout period

Hi ladies, looking for some support regarding this topic.

Last September I missed my period. I had three home pregnancy tests and one blood test done, all were negative. I never did get that period, but I got it the next month. Ever since this happened I've been experiencing excruciating pain during my period. Its a sharp pain that rotates between my pelvis and my rectum (I know - TMI). I have severe nausea and cramps so bad that it interferes with my work; I was actually sent home from the pain being so bad that I needed to take some strong pain meds.

The pain hurts worse when I'm walking or standing as well, but still present when lying down. My lower back is painful and I get these pains around the time that I should be ovulating as well. When I get the pains during expected ovulation I've taken ovulation tests, all negative. (I've been tracking my ovulation and periods and taking ovulation tests but for months all have come back negative, as if I'm not ovulating at all. )

Not to mention I have such excruciating pain during intercourse that it's been nearly a month and a half since my husband and I have been intimate. I've also been experiencing bloating worse than usual, so bad that I put on 5-6 pounds during my period, severe constipation and pain during defecation, and diarrhea, which are not normal for me. Has anyone experienced anything like this before? It's getting hard to cope when Aunty Flo comes because I feel almost crippled for a whole week until she leaves again.

Also, as a side note, my bleeding is awfully inconsistent. It's heavy one day and the next it's gone. Then a few hours later it's back and heavy again. Usually my period lasts 4-5 days but this last cycle ran from Tuesday-Sunday. 6 days.

Any help is appreciated!

Edit: I have spoken with a family doctor who prescribed birth control pills that I had taken in the past for painful periods that actually made things worse for me. I don't know if this is normal or if I should seek a second opinion.