Employer's False claims of

In 2007, I was employed with a local hospital, first as a nursing assistant, for a very brief period, I left after discussing with my boss the discomfort I felt with the position, and then a few months later in the scheduling department I was employed over 6 months, when I finally decided to leave, I prepared a written letter of resignation and spoke with the head of the department (my boss's boss) about my concerns, she informed me that she wanted to keep me employed at the facility (because I was a good employee) and I agreed to interview with any positions I was interested in and qualified for; all of my interviews went well, (I was technically offered the job after one interview) but I never heard back after any of the interviews (the job offer disappeared and no one returned my calls) my boss and the dept head then called me into their office, and accused me of not putting in any effort to stay with the hospital, I disputed this, (I had applied and interviewed for 5 or so positions) and ended my employment (that day) with a 2nd letter of resignation,I had given them the 1st a month earlier - so that particular dept. had adaquate notice. from what I understand the scheduling position is a hard one to fill (no one wants to do it.) and other employee's had a hard time transferring to different departments.
I have almost completed training as a Surgical tech and applied to this same local hospital, only to receive a reply that they would not hire me because: at the time of my termination I was reported to have performance- related concerns. I was never informed of any of this while I was employed.
I believe that in New York, ex employee's can request to view and copy personnel files up to 3 years after. What else can I do?