Thanks everyone for your input on my original question!  However, I think I
may have found the culprit. I have been taking an herbal colon cleanser that
contains among other things, cascara sagrada, fennel, fenugreek and alfalfa
on a regular basis.  I did a search on these herbs on the internet and
discovered that they are all considered very estrogenic.  In fact, fennel,
fenugreek and alfalfa are found in herbal breast enhancers!  They are also
used to increase milk production in nursing mothers!  Yikes! I am going to
stop the cleanser and see if I experience any changes.