I pulled this info from an article in the June 2007 issue of Healthy Living.
A classic Swedish massage is like 7 miles of hiking to the circulatory system because of all the stuff that gets all loosened up during the massage. Later on, all that released lactic acid, waste products, chemicals and "other" just get processed out of the body the next day.
(That's why I was told to drink a gallon of water. To get all that waste out of my system.)
I find the most common "emotional" stuff that comes up after a massage is just irritability and sadness for no reason. This is totally natural. Its just the combination of the chemicals and hormones that were sitting in your tissue that have been released to be cleaned out AND the emotions that may have been "stored" in places that were released and relaxed during the massage.
She does say to not let the downside of a massage keep you from getting one. The freedom from pain, pattern and holding is far worth the 24 to 36 hours of slight discomfort that comes after a massage.
As of right now, I think it will be quite some time before I get another massage. It is good to know that the feelings, both physically and emotionally I am feeling are normal, though.