Generally in biomedical science, measurement of "cortisol" is used, but I am looking for some "pen & paper" procedure that strikes out blood sampling or anything like that.
I am a little unsure what exactly you mean by "during a particular task" or what kind of task you mean by this. But it might be worthwhile to have a look at the following German inventory, which was translated to English and validated:
Trier inventory for chronic stress
Article Factor structure and psychometric properties of the english ...