I am in Canberra. Originally I was put on to Mexitil by a neurologist but after moving to Canberra, I simply informed my GP that I needed a prescription for Mexitil. Since then a couple of GPs have prescribed it for me. They look it up and have no issue. Of course, none of them understand MC, but who does. Only a neurologist would.
Unfortunately I no longer take Mexitil because the side effects far outweighed the benefits. It turns out I am in the small percentage of people who have high sensitivity to all medications.