Grandson develops debilitating bouts of AFib

In 2021 my Grandson, let’s call him John, who lives in Winnipeg, was forced to take the Covid ‘vaccine’ as a prerequisite to attend school (in his case, Grade 10). John was a healthy athlete.
Several weeks after the ‘vaccine’ was administered, John developed atrial fibrillation. Now 18, his bouts of atrial fibrillation are debilitating: they can occur just from changes in posture, such as bending down to pick something up, or quickly rising from a sitting position.
I’m deeply concerned for my Grandson, knowing that the blood pooling that occurs during extended periods of atrial fibrillation can lead to blood clots, and the possibility of a stroke, even in an otherwise healthy young 18-year-old.
What’s deeply disturbing is the corruption of the medical community, who won’t acknowledge either the harms arising from going along with forcing the Covid ‘vaccine’ on healthy teenagers, and are gormless (stupid) over how to deal with the complications that arise.