I didn't see where you laid out your story, sorry, but I can tell you that schools let go of people in their 3rd and 4th years for reasons OTHER than discipline or failing out. It can and does happen. Not getting a US residency is not the worst thing in the world. Irish med students do residencies in Australia, England, Ireland, etc. If you can't do residency here, you can always come back afterwards. 25% or more of practicing US physicians didn't train here.