I Am A Junkie And I Shot Up On Top

I am a junkie and I shot up on top of my foot because I couldn't hit a vein. I had to go to the ER last night because it caused my foot to swell and I'm in so much pain it's unreal. They sent me home with crutches. So there is. Spot on top of my foot that the vein now looks like it's burnt. Foot is so swollen the air from the air conditioner hurts like a MF. And the heat from a bath. Well you know " uh uhhh" nope either. Nothing can touch it absoluteleigh nothing. My foot looks like a cabbage patch kids foot it's so swollen what advice can you give me besides stop using