Bigred did you inject into your lateral head of the delt when you hit the nerve? Or where you closer to the front of the delt more than the side. I like to hit triceps, outer quads, Glutes, Delts. Never really had any issues with any but I do hit a nerve from time to time in the quad. The quad will twitch and some pain going in. I now go in slowly into the quad so I can feel more if there is pain in the location or not. check out
www.spotinjections.com for more ideas of how to hit proper injection sites.