I am cleared to drive, Am I able to get my job back with USPS?

I was employeed for almost 5 yrs with USPS as a Sub-Mail Carrier AKA RCA. I began having episodes (seizures) that occured while I was driving my personal vehicle and then once in my mail truck. Completely afraid, I went to the Dr. Who restricted me from driving. This began in Nov 2011. I stayed in touch with my supervisor on a Bi-weekly basis throughout this entire process. They were trying many different medications and procedures to try and get this problem under control. I was being seen by my primary and two specialist. In Feb. 2012, My supervisor informed me that he was being transferred to Atlanta and I needed to stay in touch with George S., who was promoted to supervisor. I know george and he knows me and my situation. I did as he said and called George to keep him informed. My next appt was April 12th (I think), and when I left the Dr and called George to let him know that I had not been cleared but the Dr was confident that the meds and treatment they have me on, is working and I need to return to them on April 27th for my next appointment, George told me I needed to come in and have a meeting and bring in my documentation. I agreed and that following Monday I went into the office with all he had requested. He made copies of my paperwork and told me to let him know what the dr said when I go for my appt. Somewhere around April 15th, I received a letter of termination due to my attendance. I have never been in trouble, never been written up, a;ways done my job and always was willing to help in the office even if it was not apart of my job. I am cleared to drive now and I have not had any episodes in about 6 months. Do I have a chance to get my job back as a good employee before I became sick. Thank you for your help, I just dont know where I stand or what I can do and I truly loved my job.