I'm not sure if i've injured my shoulder/arm.

I've been sat at the computer all day (don't judge) and hardly move my arms that much, so i'm wondering if the muscles in my arm have like... locked or something? I'm not great with explaining things, so sorry for poor description.

My mind instantly jumps to conclusions like "It's broken", "dislocated", ect. So could that actually happen to someone hardly moving their limb?

The pain is sharp, and my muscles feel quite tight. It feels like if i move my arm too much outwards that it'll snap or pop. (pain starts from the center of my arm up to the side of my neck)

This scares the living hell out of me, since i'm a huge wimp that over reacts.

Okay that last line wasn't necessary.

So, has this happened to you or anyone you know? What did you or the person do to... heal it? Is it serious or something that can sort itself out?