Katie Robertson, who gained a following on social media as The Wheeled Piper, has navigated several different chronic illnesses throughout her lifeKatie Robertson.Credit: Mae McKay/InstagramNEED TO KNOWKatie Robertson, 19, began playing the bagpipes in school and found solace in music as she faced numerous health challengesShe gained a following on social media by sharing videos of herself piping as The Wheeled PiperAfter being diagnosed with a …