I woke up randomly tonight and stayed up for a few minutes and just as I was going to back to bed the right side of my back started hurting, specifically kinda behind my shoulder area but also a bit to the side of it

the pain comes and goes, it feels like there’s a pressure building up or something, it’s really annoying, been like this for 30 minutes 
I’m just anxious about it, honestly it’s probably just my muscles or something.

My grandmother passed away a few days ago, so maybe that has something to do with it.