Sorry you're having a tough time right now. My husband also has problems with making mistakes related to his ADD. Are you being treated for it? Could it be time for a medication change? Are there a lot of distractions around that could somehow be minimized? Is there one particular area where the mistakes are happening or is it more of a general focusing issue? I'm not sure what employment resources you have available in Israel, but here in the US, ADD is considered a disability and employers are required to make accommodations for it if at all possible.

Here's a link to an article you may find helpful:

http://www.additudemag.com/adhd/article/862.html

There may be things you can do to make your workplace more ADD-friendly or tools you can use to improve your focus and reduce your stress levels when things don't go well. In addition to the article, there are books out there specifically on workplace issues for adults with ADD. Here's a link to one of them, but there are others:

http://www.amazon.com/ADD-Workplace-..._bxgy_b_text_b

I hope you're able to find some relief soon.