Did you use a different detergent to wash your clothes with? I still remember the strong reaction I had in some public restrooms, a yearning feeling, and I finally figured out some restroom soap smells like Jergen's lotion and my mother probably wore it when I was little (late 1940's-early 50's) and I was being triggered by the similar smell. Maybe you have had contact with a random smell that did something like that for you and mixed your mother and therapist or just your therapist and created a transference memory or something for you.