I'm happy to hear there are physicians who would be willing to help. But I think you'd need to figure out how to restrict the responses. Perhaps set up a doctors group that can post freely, but require moderator review for all other posters to the forum.
On my site the amount of bad or inappropriate medical advice was horrifying enough that we just banned medical questions entirely. It appears to be an unfortunate feature of the Facebook age that those who disagree with standard medical care tend to be the loudest and most persistent responders to medical questions. Perhaps the focus here is narrow enough to avoid that without special effort, but I doubt it.