I Shot Up Meth In My Wrist And Now It

I Shot up meth in my wrist and now it is swollen out about half a center meter. .it's ssore but not too much. .like no sharp or burning ..just sore what should I do. .I always have chest and achy arms after shooting. I'm a new user and only shoot up because my friend does but wanted to try on my own now I'm worried what should I keep my eyes open for