I'm a 34 year old woman. The last 3 days I have experiences a dull pain in my right hand side of my chest. Just below my breast, under the rib cage. Most times it's dull, but there are moments that I have sharp pain that stops me for a few moments until it passes. I have also noticed that my neck and shoulders are a bit stiff as well. Other than that, I'm sleeping well, eating well, acting normal. Is this a hernia? Ulcer? Maybe just stress? Thanks