so, I went to the chiropractor this morning. Breathing is much easier now. He said that with the Buffy dance move where she throws her head back (which I know is how this started) I effectively gave myself whiplash and pinched a nerve in my spine. This nerve controls the muscle that's in spasm next to my left shoulder blade. I'm going to take it easy for a couple days and see him again on Wednesday. He doesn't think I'll be 100% for Friday, but I should be able to perform.
In the meantime he wants me to ice it and stuff. And try to get back off the ibuprofen.
It really had already settled down a lot over the course of the day Sunday, though riding in the car to grandma's was a little tough on it. I took my hot pack and took a nap at grandma's with that on and that helped.