Just to reiterate what everyone else has said, it's too much trouble when you can get into a UK medical school, with less cost and much more easily in comparison. I've studied in the US, and very quickly I realised how similar it was as the UK - you'll become used to your surrounds way too quickly to feel like you're in another country. The culture is somewhat different along with approach to teaching and education, but you would've gone through a load of headache for ultimately the same qualification and a significantly higher cost.
If you really want to go to another country following your medical degree, try Canada. I didn't find anything attractive with the US healthcare system, in fact I came to realise how fortunate we are with the NHS whilst I was abroad, having to pay for medicine, blood tests, insurance etc.