I have to admit the replies are nothing like i would've expected. I guess the experience is different for everybody.
For myself it was very dramatic. My hair started falling out during the period of high stress, i was in a shock multiple times, eg. my hands were shaking and i also got physically sick once or twice shortly after the big loss. On the mental side it happened much more often, it was like very very strong depression, like a self-perpetuating mental state that is very hard to get out of. Not pain, but horrible feeling where everything loses it's meaning, you feel completely empty and you just wish you could end it all. I am not suicidal(and never were), but when you see a truck coming by you just wish it could be it. But that'd be an easy way out.
All of this is a result of highly leveraged trading and losing soul crushing amounts of money in a short period of time. Easy come, easy go.
I blew many times, when i did not expect something to happen and yet it did, i did not have stop loss set and ended up getting liquidated several times, also adding to losers and hoping for a reversal. It's hard when you keep losing, it's hard when you are right and still lose money due to poor execution, but the hardest hit comes when you think you have have it and when you are slowly but consistently making money for several months and then you blow it all in one moment.
It's not only about the losses, but also about the potential profits you could've had, had you had a plan and didn't act emotionally and out of frustration. When you actually had it but then you bailed out, only to see your position would've been up a dozen K by the next day. It's slightly easier if you can blame it on the lack of experience - you didn't know, you'll get it next time. But still...
I do not wish those feelings for the worst of my enemies.