You are not using stops.
No way you should accept a loss like that.
If you bought @ $15, you should have had a stop @ $14.70
Always limit your losses.
Never let yourself get in a hole like that.
Last week I bought DGAZ @ 11.58. When it got past $12, I put a stop @ $12. Saved me from taking a loss, and locked in profits.
You should never trade without stops.
Set a loss that is the most you are willing to accept, and stick to it.
For me it would be 3-4% at most. I won't accept a 5% loss.
This is "trading 101", basic stuff that you should know before assuming risk.