Hello...I have pain in my whole arm, this after 4 days post blood draw. When I had my blood drawn on Monday, i had significant pain in my hand (location of the blood draw) about 10 minutes after it was drawn. A large hematoma appeared on the back of my hand, I applied direct pressure and the pain went away until today (Friday). Now the pain encompasses my whole arm and underarm, why is this happening and how do I releive the pain?