Can't answer your question, but have you tried acupuncture? My acupuncturist told me to come back after the baby was born and she'd be able to prevent it for next time. I didnt go back for various reasons and am now seeing a new guy who's said the same thing. It's easier to prevent it before pregnancy. I think you need to start treatment at least 3 months before conception, but you'd need to talk to someone about your own case.