Firstly: Politics is certainly the biggset contributing factor in Switzerland. The politicians and anti-aircraft-lobby make up procedures regardless of safety....and that is stressing.
Secondly: When you look across at the neighbouring sector and see how badly that controller works because he / she is not really interested or just plain lazy, then thats extremely stressing!!!
Thirdly: People asking me about the causes of my high stress levels.....
All very very stressing. Another scotch please if you will.