I can't raise my shoulder with bent arm?

The past 3-4 weeks I've had shoulder pain that's getting progressively worse. Starting a couple of days ago, I can't raise my arm past a 45 degree angle when my elbow is bent even slightly. Neither to the side nor in front of me and there's only minimal pain when elbow is extended. Of course I'm going to see a doctor soon but I was wondering if maybe anyone had any ideas or where I can search for ideas lol!