Okay, so I've injected 100+ times..
I pinned my shoulder last Thursday with a 1inch pin. I put 2 1/2 CC's of test enethate.. I pinned just a little bit off from the centre of my delt (towards the back), no more than an inch off the mark.
It feels like I've pinned into a tendon or a connective tissue because i havent been able to move my arm until today (three days). Its definately swollen up, it feels as if it was my first injection ever, x2.
Its getting better with heat compresses,
but I'm just wondering what I could've done. 
Thanks.