Maybe you just want to do med school in the US? MD/PhD programs won't give you credit for having done a PhD already so I don't know what the advantage is.
If it's a financial thing, bear in mind that few programs take international applicants and that it's much harder to get acceptance as an international - most public schools won't even look at your application because you can't be on an NIH grant as an international. But some do so you could try...
Or you could just apply for an MD program after finishing your PhD and pay for it.