If your teen has been diagnosed with POTS - Postural Orthostatic Tachycardia Syndrome - you already know how fast it can derail a young life. One day they're active, thriving, full of energy. The next, they can't stand up without their heart racing. They can't get through a school day without feeling like they're going to faint. The migraines and brain fog make even simple decisions feel impossible. And the answers most families are given? "We don't really know what causes it