I Am Having Quite A Bit Of Pain In My

I am having quite a bit of pain in my right shoulder. It started Saturday morning when I woke up. This has happened before and usually went away as the day progressed but this time it seems that it will not let up. It hurts more when I move it side to side. I can go up and down straight out just fine without any pain. I cannot hold it out in front of me for a long period of time without being in a lot of pain.