Does anyone have any experiance of back and pelvis problems in pregnancy?

Had to go to hospital at the weekend with extreme back and pelvis pain - the doctors are referring me to a physio as they think the ligaments in my pelvis have softened. Apparantly there is a chance that I could end up with my pelvis splitting and having to walk with crutches and/or bed rest for the rest of my pregnancy (12 weeks).

Have tried paracetomal which doesnt work so the doctors at my surgery prescribed me co-codamol at a low doseage which again didnt work. The hospital gave me a much higher doseage which caused me to hallucinate so they wont prescribe me that even though it took away the pain. Have tried massage, hot baths, hot water bottles etc and nothing. Was advised to try a TENS machine but the hospital then advised me against it as it could bring on labour.

Had another appointment at the hospital yesterday and have had another referral - am there at 9am on thursday. The midwife pressed about this afternoon and I nearly punched her was in that much pain.

They have said it is DEF crutches and might even have to have a Csection due to the problems im having as they are only going to get worse apparantly.

If anyone has any other advice I would greatly appreciate it as the pain is really bad and NOTHING seems to shift it. Whether Im sat up, laid down, staying still or moving about Im still in agony