Happiness and excitement are also forms of emotions and although they are positive emotions, they can still be very dangerous emotions to trade with. While making analysis to set up a trade, you have to be as clear headed and minded as possible, Happiness and excitement can make you make wrong decisions just as the other emotions that you have mentioned. An over excited trade is very prone to making mistakes out of too much uncontrolled excitement. To be a good trader, you must know how to balance and keep your emotions controlled when making analysis.
I believe it could affect our trade but we don't have to let this emotion as a reason why we fail to decide right. The more we are happy, means we are very comfortable with our doings and even more motivated to do so. Because what I mostly observed is that those people who think negatively and are unhappy usually got in big trouble and eventually lose more control of their emotions leading to losing funds.
Besides, we don't need to stop everything and feel nothing. We can still have those emotions (positive and negative) but of course, the most important is we know how to manage ourselves when it comes to making a decision.