I have no idea what it's called, but I was once taught a type of meditation in which you can control the blood flow to various parts of your body with your mind. I'll try to explain it the best I can. Lets say you wanted to increase the blood flow to your legs. As you breath in, you simply visualize how your blood is flowing through your body imagine pushing more blood toward your legs. The same can be done in reverse if you want to decrease blood flow to a certain area just imagine pulling the blood away from that area with every inhale.
Other than helping with pain, I've also found this to be useful in other situations. They always have a hard time finding a vein when I go to get blood work done, and me concentrating on increasing the blood flow to my arm has actually made the difference in them finding a vein on the first try.
Allergies, Asthma, Anxiety, Depression, IBS, PCOS, Fibromyalgia