Stress is a surge of an energy that wants to come out of your internal levels. This is the highest point of your capabilities. You inability to bear and use the stress renders you incapable of reaching a Relaxation also. Stress and Relaxation are two sides of the same energy expression. It you force stress not to descend on you then the relaxation would also stand eliminated from your mind.
This video shows what to do in case of stress:
Driving in itself is a big issue when it comes to drive in the crowd of a metropolitan city. In the early nineties, I also faced this problem. To overcome the strain I preferred to enter a Dhyana or a deep meditation. It reduced my stress and anxiety. There was no tension, no stress and no anxiety.
Your conscious mind that creates the problems of depression, prostration, stress, anxiety and nervousness can be sent to a back seat and your subconscious mind from a deeper psychological level can be invoked to take a control so that the acts are performed with a greater precision and higher accuracy.