Negative and even positive emotions have a detrimental effect on your trading. It makes you deviate from your current plan and it will make you lose money. I, having been an emotional trader, know this all to well. What seems to help is taking a breather once in a while. I looked for articles online, here on babypips, reddit, even profiforex, my own broker had articles on trader psychology and it all boiled down to detaching yourself from emotions while trading and sticking to your plan and going through with it.