Rigga - I had diastasis of the symphisis pubis with my 3rd pregnancy. DD3 was born vaginally with only the gas. I was wheelchair bound for the final month of pregnancy. If anything the separation made a vaginal birth quicker and easier. I was advised by my Ob (there are stacks of threads around about it) that she would not recommend a CS, but that if my pain increased during labour she would take me in for an emergency CS. I would recommend you do a lot of research prior to arranging a CS because the recovery from a CS is worse than I have found the recovery from the diastasis. I was walking (very gingerly) 3 days after she was born. With a CS they will not discharge you until you can walk around, and it will be harder for you to walk around with the combined pain.

I do know you pain, I was on panadiene forte for months, so believe me when I say that you may be able to have this baby vaginally. It may also help to align your pelvis having even pressure on it. Do avoid drugs, and if your pelvic pain increases in labour tell your caregivers.