What could cause excess cortisol in the saliva and swollen parotid gland?

Cushings Disease. There are many conditions that can be related to the question you are asking. It is best to see your internist for a thorough evaluation and diagnosis. For more information regarding cushings syndrome you might check - neurosurgery.Stanford.Edu/pituitary/cushings_syndrome.Html and for salivary cortisol see: macses.Ucsf.Edu/research/allostatic/pdf/faqs-salivcort.Pdf.