yes, there are many articles on it. So I did a quick google search and got this: "Serotonin":http://www.nasw.org/users/twoharts/serotonin.html
Serotonin is a neurotransmitter, a specialized molecule that allows nerve cells to communicate and interact with each other. Without neurotransmitters we would be unable to think, perceive, move, or even live. Serotonin also does double duty in the cardiovascular and gastrointestinal systems. It helps regulate the expansion and contraction of blood vessels and the function of platelets, the blood cells that cause blood to coagulate and close a wound. It also causes smooth muscles to contract, such as the abdominal muscles that aid digestion by pushing food through the GI tract.
I am still looking for any research connecting edema and veins. So far, it appears that Food Grade Diatomaceous Earth and the herb horse chestnut have good results for capilary leak. Then there is the long term "survivor's letter": (http://www.26blue.com/index.php?title=Capillary_Leak) on "accupuncture":http://www.wellspringseminars.com/index.php/about-dr-tran.html