Left shoulder in pain, can't lift arm over head
I have been picking up my training volume over the last week with great success until yesterday. I was doing biceps and did EZ-Bar curls along with wide and narrow grip curls on a preacher bench. Sometime during the workout I injured my left shoulder, but I didn't feel anything until about 4 hours later at work. I'm assuming it's from trying to get the bar into or out of position on the preacher bench, possibly when my grip was way wide or narrow. I knew going into the workout that I should have taken the day off because my upper body was still sore from the week's workouts but me being so stubburn I did it anyway.
I tried an Icy Hot patch a few hours before bed but it didn't really do much. I woke up in worse pain than last night. The pain can be felt most intensely when my palm is face-up and i'm raising my arm over my head. In fact, I can only get my arm a few inches up. The pain diminishes substantially if my palm is face-down. I think this fact will help pinpoint exactly what the problem might be. Any help would be appreciated.