Yes, my nephew had it 20+ years ago. My sister was worried sick about him, but he is now 25 and played sports and has no problems whatsoever, they made sure they kept checking his heart throughout the years and he's had no problem.
I wouldn't have heart failure just yet. It was very scary for my sister and she wigged out back then. It was attributed to the chemicals in new carpeting being installed during winter months when the house was all closed up, that was one of the theories back then, I don't know if that has changed since then.
I hope she is better soon.