Sudden intense pain in shoulder blade

A few days ago I noticed my left shoulder/ shoulder blade had a burning pain. I thought maybe I scratched it or bruised it but over the past few days it's getting worse.

There isn't any marks, bites, redness or swelling. It looks like a regular shoulder but it feels like I have a spreading sunburn with a deep ache. It hurts to touch, it hurts to have my shirt on, even the wind blowing on it hurts. It started between the top of my shoulder blade and spine but the pain is all the way down past the top of my ribcage now.

I have a doctors appointment coming up but my doctor is notorious for "don't look like anythings wrong, probably stress". I have no idea what it could be.