4 months postpartum and having major pelvic pain

Help! I had  my baby 4 months and every since I have been having pelvic problems. The problem is I only have the pain at night, after I've laid down for at least an hour. It doesn't matter how I lay, the pain always occurs. Usually it goes away during the day and I feel better. The pain is more in the pubic bone area. Me and my husband haven't had sex since my pregnancy because the pain is so excoriating. I've been to my ob/gyn 3 times about the same problem, they done 2 ultrasounds and cultures. So far, the only they told me is that I have vaginosis. However, every time I've read on, no where do I see it cause extreme pelvic pain. I don't know what to do but I know I can't keep going through this pain that keeps me up at night. Has anybody experienced this or know anyone who has? I am really reaching out.