Glad you made an appointment, ST. I'm not a fan of doctors either but it's worth it just to have some idea of what's actually wrong. Gives you something to work with.
Today was productive for me. Had my first physical theraphy session and discovered there are muscles in my shoulder I never knew about that will be sore tomorrow. Also got a good explanation of what "impingement" is (rotator cuff muscles getting pinched between the arm bone and collarbone) and how to work around it. Nice to have knowledge and a plan.
I also replaced the old leaky faucet in my kitchen with a shiny new one that you can pull the head down and it has a hose built in to it. Only sprayed myself in the face with rusty water once or twice, too. In fact I was feeling pretty competent, and then I went to get groceries and locked myself out of the house.
...
At least I know how to break in, now. Should probably make "install a deadbolt on the back door" my next project, though.