Hello, my 7yr old son has being seeing a gastro Dr. for stomach pains that have been increasingly worse in the last few month. Nothing serious found after multiple blood, urine, fecal, Upper GI Scope & Sigmoidoscopy with biopsies, and CAT scan. Diagnosed with Chronic Functional Abdominal pain. Have tried a couple of meds to help with pain, but no luck. Before trying him on amitriptoline, he had some blood work an a EKG. EKG results came back borderline abnormal and I meet with the Cardiologist today to review the findings. What could cause this?