Pound scalping

Very good scalping except last trade. Range got bigger and I was step to lose all profits so far in move against me. I couldn't cut it because range was still valid and in the end downside prevailed but it would be better if that was half size trade. I was mentally tired and took just small profit out of it to quit for today.
Also I would like to mention first trade that was short after 40 pips drop in a less then a minute. It was scary, first and second trade, just because of prior move scale.

+20 pips