Hey there,
I've had unbarable shoulder pain. After years of agony, I went to the doc. got an MRI turned out I had frozen shoulder, a nerve inpingment, torn rotater cuff and on and on. I had surgery about 3 years ago and now that's the only "good" joint I have in my body. I was a hairdresser for 25 yrs. so I had done alot of damage to it from work related injury.
I hope it feels better, I know how annoying shoulder pain can be. I agree w/ Denise, warm moist heat!! Get some rest and take an anti-inflamatory.
Take care,