All of a sudden in the middle of the day I felt a pain in my foot, didn't really worry about it untill I got home and it started hurting extremely bad, it hurts to put weight, can only put a little weight to walk on. I realized that the pain was coming from a vein running across my right foot which was raised a bit, it hurt to touch it and it hurts to walk on it. Getting scared, have no idea what it is, please help.