I did put some planning into the initial trade (not enough, but some) and getting stopped out of that was fine...we will lose many many trades in our trading careers but active throwing money away... silly Gavin.
I am afraid you will repeat those mistakes again, again and again. You and I know those mistakes were psychologically induced. Unfortunately in trading, there are specific instances when we are stressed or emotionally compromised we tend to make those mistakes that you experienced. It is a common trading problem and wishing or willing it to go away will not work. You should know better because your major is in psychology.
A trader's mind in making trade decisions is governed either deliberatively or intuitively. Our training is build upon a deliberative process in making trade decisions. This domain is challenged when our psychologically state is upset when stressed and the intuitive mind overrides the deliberative mind. This is when you make silly mistakes and post reflection will tell you so. The challenge is at that moment how do you stop the intuitive mind from overriding your deliberative mind? Just as in developing your trade skills, developing your trading mind requires a process. It doesn't happen by willing it. It requires specific defusion techniques that you practise and practise to become second nature.