Well, I do agree that if at the point of trading, one is experiencing that kind of fear and anxiety, best decision to make is to take a break. Fear can lead to losses, it can lead to making wrong calls in the market, it has a big disadvantage on the trader. So, when one is experiencing a sudden fear, they should not trade at that point, until they have killed that fear and are in the right frame of mind.
i losses in many trades for my fear and panic, i agree with you, if traders started trade with fear then there are high chances to make wrong decision, i feel it when i faced such issues, and happened with me for a lot of times, this is good point out we should take a break when feel fear in trade.