I'm going to stick my nose in, even though I don't have any experience or specific knowlege here. (That hasn't stopped me before :-)
Yes, the way a person reacts to and handles stress can effect libido and lots of other things. An apparrent loss of libido could be a symptom, not the actual problem. The cause could be - NOT the actual stress - we all have that, but how a person handles it. Perhaps counseling on that issue would help?