i had a frozen shoulder. i had fallen on ice 6 yrs earlier & in that time lost gradual use of right arm, couldn't move it very well & what little it did hurt like heck. they did surgery to repair that old damage which included a broken bone chip & a muscle with a big hole in it. a few months later, the shoulder was freezing up again & they put me back in hosp & under general anesthesia, they did what they called a "manipulation". they took my arm through a whole range of motion & broke it free of all the material holding up progress. i started physical therapy while still groggy & now have full use of it. it's now been several years since all that & i'm still fine. sounds like you need to see the doc & find out what it will take to loosen up that shoulder. don't blow it off. this won't get better on its own.