I hold MD which is equivalent to US MD.To practice medicine in the USA I should have a state license. To get this license I need at least 4 years , my age will be 70 tell me do u have a hospital to hire me ? I applied for nursing instructor job but they didn't take me because I have no any certificate from an American medical school .I applied to medical school to obtain a certificate in phlebotomy.......yes in phlebotomy but they say am over qualified and I was not accepted for admission.This is my story and this is why I can't go back to my previous profession.Do u understand me now my friend?