Question about injury

Today during practice we were going live. My partner got behind me with my arm trapped and mat returned me. When he did so I l couldn’t catch myself and landed on the side of my head/neck, for a few seconds I blacked out. Whenever I move my shoulder joint in any way it brings out discomfort around my trap/collarbone. The trainer said it was probably just muscle, I just wanted to know y’all’s opinions and any way to bounce back because I think I’m out of practice for the rest of the week.