As a suggestion: read Trading for a Living, and Come Into My Trading Room, both by Dr. Alexander Elder. I don't believe he focuses on stochastics, but he does focus on swing trading and I think both may be helpful.
Having a tighter stop will cause more losses, but smaller ones. Everything is a trade-off, but with good trades chosen, good position sizing, good stops, and knowing when to exit will hopefully prevent such a large loss of gains.
there is a lot to learn. Some of the best learning comes from making mistakes; but it also helps to know why the mistake was a mistake - or there is no learning at all. On the other hand, there is value in learning what has been a mistake for others; at least in can help prevent making unnecessary mistakes.
The market has had a number of hiccups since March, 2009, and doesn't seem to want to make a steady bull market out of the chaos. And scan of any number of stocks will show gains since then, but not without some dips here and there, for who knows what reason. Don't give up; I think if you read those two books (and you may want to read them numerous times, as they are loaded with information) and learn from this go-around, you will do well. Rome wasn't built & etc.