I've told my last two employers before I was hired. I was very upfront and honest and explained that I was simply informing them because it has caused problems in the past. I told them that I didn't know what I had before, but now I do and I take my meds religiously. I told them that I'm not perfect, but do my best.

I got both jobs. It helps that after I get the job, I work my colleagues under the proverbial table. ;-)

I really wish I had been diagnosed while in the USMC. I honestly think I could have made a career out of it.... Or at least I would feel better about "being a screw up"