FORT MYERS, Fla. POTS (Postural Orthostatic Tachycardia Syndrome) is sometimes called the “invisible disease,” and that’s no accident. Doctors estimate that it affects 1 in 100 teens, but it often goes undiagnosed for years or is misdiagnosed as anxiety. Dr. Annette St. Pierre-MacKoul stopped by the WINK studio to shine a light on the mystery illness.