Its hard to stay calm or a trader will experience anxiety and nervousness in his trade if he/she will monitor or look at his trade time to time, seeing your trade having a downtrade can affect your decision that's why its important to divert your attention while your trade is open it will only afd to your anxiety if you keep on checking it, if a trader has trust in his analysis and trade then he/she doesn't need to keep on looking on his trade its better to see it to the end, but of course its also common and normal to exit early in your trade its up to the trader if he/she will exit his/her trade and not follow the TP or SL set up, but yeah regret can be a common thing in this situation, many traders do this to cut loss which is not advisablr everytime, its still better to let the trade be at end.
I feel like if you are feeling anxiety after a while of trading, then you should stop trading and take care of that part first. I get that it doesn't have to be that quickly, just focus on what you could do and you would be able to handle it very well.
I personally believe that it is going to take a while, and not everyone will have a chance to do anything serious, just ignore all the trading, all the indicators, all the bigger deals, just ignore them all and focus on what you can do with something more serious like your emotions.
If you focus on that, then you are going to end up with something much more important, it should be important to notify that we are going to end up with something more rock solid with our emotions before we restart trading. Obviously, we all know that not everyone will be able to do that, but if we give it enough time, then we are going to end up with a great return, and should be something that benefits you when you restart.