I'm still with the company above - we have a hoot of a time in our department and you could consider a couple of us "unemployable" but we tend to be the ones who think outside the box and come up with novel solutions.
My eldest son has Aspergers and he has found a job he loves and my my stepson (he has ADHD) has just started a trial job round the corner as an engineer.
Don't give up yet - there are companies who embrace engineers who are a little "different"