If I am by myself I find it fairly simple to "turn off" my stress and focus on the task at hand, employing the same rationale that you mention: being stressed i

If I am by myself I find it fairly simple to "turn off" my stress and focus on the task at hand, employing the same rationale that you mention: being stressed isn't helping anything so let's focus our energies on fixing this problem. One of the biggest obstacles I find in a working environment, however, is other people's stress. If someone is relying on me to fix a problem and they are very clearly stressed out about it, I find that their stress can impact me greatly. There is also the aspect that if I am able to be calm and focused during the stressful situation, while they are clearly stressed, it can be perceived as me lacking concern or having a blasé attitude toward the problem at hand, in comparison.