I'm sorry you can't confirm the type. I have Thomsen's and my mother never had any symptoms even though her EMG was positive. It's interesting how much variation there can be even within families.
Dr. Lehmann-Horn's lab in Ulm, Germany used to do full sequencing free for members of the Periodic Paralysis Association, but he retired several months ago and they quit offering the service.
Do you have myotonia affecting your eyes, tongue, throat, diaphragm, etc? That seems to be strongly associated with dominant MC...most of the people I know with Becker's don't seem to have as much trouble with the muscles in the face.