when i injected the heroin i got a bad burning down my arm from my elbow to my hand. I got hives allover that part of my arm and my hand swelled up. it went away pretty fast but now i have stopped using its been four or 5 days and my middle finger is getting this like electrical pulse through it when i move certain ways or go to grab things. what could this be and is it going to heal itself or do i need to see a docter? i injected in the crease of my elbow