I don't know enough either, but a fun thought experiment is maybe we're the anituniverse? There's a lot more mass in the universe, than there should be, and we don't know what it is. It's just "dark matter" and "dark energy".
Edit: please correct me if I'm wrong, I've only read pop science stuff like Hawkins books
This looks promising, way more promising than any other cure for MS I've read about