It is typical for a kidney stone to manifest severe, sharp pain in one side of the lower back . Pain from a kidney stone irradiates from the back to the front side of the lower abdomen and down to the inguinal and genital region. A constant ache and pressure under the left ribcage, however, doesn’t seem likely to be due to a kidney stone. You need further examinations such as a physical examination, abdominal ultrasound, and blood analyses (blood count, sedimentation, liver status, renal status etc.) to identify the real reason for the abdominal ache you are experiencing. You can consult an internist about that. Emotional irritation and sensitivity to sound are probably not related with the abdominal pain.