I Attempted To Inject Heroin Into My Arm In The

i attempted to inject heroin into my arm in the same spot ive done so before..immediately after injecting a tiny bit (not even 1cc/100) a severe burning sensation shot down to the center of my hand and then pain in the middle of my forearm. The pain subsided and was replaced with numbness and swelling (mostly of the hand) and blotchy patches up my arm. Does anything come to mind? The pain was extremely intense at first