About 4 months ago out of no where my arm hurt really bad and got numb. It felt like when you are giving blood and they tie your arm to make your veins big. This lasted for a couple minutes and then went away. After this, from time to time my arm will have a tight, tingly, sensation.. sometimes painful, but very little pain. About 2 weeks after this happened I noticed my veins in my arm are very visible..it gives my arm a bluish greyish look. It has been 4 months and nothing has happened like the first episode but the veins are still very visisble and I get the tingly, tight sensation. I have been to chiropractor which did not help, and also doctor who diagnosed it as tendonitis because of pain when he pushed on my arm.