What Can Cause Radiating Discomfort Under Left Breast,shoulder Blade,arm And Neck Area?

i am a left handed first of all. I am feeling some radiading discomfort under my left breast, shoulder blade, some on my arm and neck area and tingling sensations on my cheek. in the past i've been treated for a pinched nerve on left side of neck-shoulder. Usually once i get massaged it goes away for awhile but i am concerned