I suggest you search for a more reputable psychiatrist. My mom is a family practice doctor so she already knew of a very reputable psychiatrist for me to see, but I know that there are plenty more out there.
Did you see a psychiatrist in the past; or did you see a general practicing doctor?

If you did see a regular doctor, I strongly suggest you see a psychiatrist instead. One of the reasons why it took the whole 14 years for me to be diagnosed was because I had always believed that because my mom was a doctor, she would know if I had AD/HD. She seemed to think so as well, as I did not have the most easily recognizable symptoms she was taught to look for. But when I went to a psychiatrist to deal with my 'depression related problems' he diagnosed me with ADD, and my mom and I were both quite suprised but extremely enlightened as well.

As for being worried about people at work finding out; I honestly think that it won't be as bad as you're anticipating. I'm still in high school myself, but even in classes where kids will joke about how "ADD" someone is, I'm not afraid to say I'm ADDbut it doesn't mean I'm how they say. They always backdown and say something like "well, he's just messed up or something then". I think the truth is that most people really don't know very much about ADHD. The popular theories that fill people's minds tend to be wrong, and that can be a little frustrating, but for the most part, as far as I've seen, because people don't know what ADHD means exactly, they don't have much basis to look at you differently.

I've also tried many different medications. It took me almost a year before I really got my medication right, but trust me, it's definetly worth it. I encourage you not to give up, and to keep looking for help.

I wish I could help more, but all I can offer at the moment are a couple links:

http://www.add.org/help/index.php - Attention Deficit Disorder Organization; they have a help page to search for professionals and local support groups

http://www.adhdcoaches.org/content/acomembersearch.html - ADHD Coaches Organization - I don't know that they are psychiatrists, but they could probably offer a whole lot of help