It sounds like you may have a pulled muscle, since it's responding to all sorts of physical prompts (sneeze, raised voice, etc.) Or you may have a cyst, which can be quite painful. Thankfully, pain is seldom a breast cancer symptom. If your breast starts to appear infected (red, hot, swollen, itchy); or if you discover a lump, or notice some other physical change in appearance, then you should see a doctor. Also, you should see a doctor if this pain lasts longer than a month, without getting any better. Ask your hospital if they have a lower-cost walk-in clinic, or a long-term payment plan; or how they handle patients without insurance. Don't let lack of insurance stop you from being responsible about your health, OK? Take care- PJH