Should I send an apology letter to people I used to work for? I really did something horrible to them?

Back in 2007 I worked as a secretary for several doctors. During that time I became horribly dependent & addicted to a non-narcotic pain medication that my doctor kept prescribing to me. It was Ultram. Anyway, I had worked for many, many years for the same agency, but in a different city. When I transferred to this position in a different city I was making horrible mistakes, leaving the door unlocked, etc. I was out of my mind because of the drugs. The supervisor was, and is a very rude girl. When I first started working there, even before I started messing up, she would scream at me, and tell me stuff like, "Just because your new, I do not want you bothering me with questions. If you don't write down the directions, or instructions I give you, your **** out of luck!" She was a real b*tch. I think this made me even more messed up. Anyway, I ended up calling in a fake prescription from one of the doctors. Low & behold I got caught, because the pharmacy faxed back a refill request, and my boss got it. Instead of confronting me when she got it, she waited till the end of the day, then called the Dean, and they confronted me at the end of the day. I ended up quitting before they fired me. I was so upset, that I drove straight to a rehab, and checked myself in. It has been several years, but I feel I should send that doctor an apology. Frankly, I don't think my ex supervisor deserves one, because she was always very nasty to me, even in the beginning, before my erratic behavior began. She also talked the doctor into filing charges on me. I got in trouble with the law, which I deserved. My question is, should I write the doctor an apology?