Hi. I'm 26 years old and for the past 6 months I have experienced pain between my left breast and arm pit, this also causes tingling and a dull ache in my left arm. No physical activity that would cause any strain. I'm healthy and stay active. I'm currently on Lo Ovral birth control, I take 400 mg of Folic Acid and occasionally an over the counter sleep aid with no asprin. Any ideas on what this could be??