I have sharp pain under left ribcage that worsens when i inhale making it difficult to breathe, left shoulder pain and yellow stools? blood results ok

See below: You describe pleurisy or pericarditis. If your pain is relieved sitting forward, worse lying on your back, you likely have pericarditis. If not, it's more likely pleurisy. These potentially can be serious symptoms and should be investigated. Do you use birth control pills ?(cause blood clots); do you have fever? (may have pneumonia). There are other serious rare causes as well.