I have a dull ache/pain on my left side. I have had a CT scan thinking it could be kidney stones. No kidney stones..hooray...nothing was sighted...but am.still worried. Docs think its just muscular...do you think it could be and if so how long could it take to heal...it only pains when sitting...when walking theres no pain and no problems...does it sound muscular? Im just over worried...thanks soo much for any advice.