The Marketing Scales website is a gold mine of information. It is the only source that helps me understand the psychometric quality of the instruments used in past research. I recommend that researchers bookmark this site . . . they will be back!
Anxiety (Service Usage)
The degree to which thinking about the use of a particular service makes a person feel uncomfortable is measured with four, seven-point Likert-type items. To be clear, it is not usage of the service itself that causes the anxiety but rather thinking about using it that causes the problem.