Can I get a PhD at another Uni?
I assume institutions will want some background on your past 7 years. It may be hard to get into higher ranked institutions, but perhaps lower ranked institutions may be more accommodating. I'm not sure what you mean by "abroad' though, and you didn't mention your career goals. There are many great institutions around the world in mathematics and physics, such as in various EU/Nordic countries, USA, Canada, Australia, India, Pakistan, Gulf Countries, Russia, Korea, and Japan. I've heard from a prospective PhD student, although have not verified, that sometimes institutions in various countries will be willing to reduce the application standard for Western applicants.