The Extreme Makeover Home Edition team provides the right medicine for a young man whose house was making him sick.It wasn't easy for Carrie Powell to bring relief to her younger son, Keenan, who suffers from a rare cell disorder, asthma, as well as allergies. It was all made worse by the dust and living mold in their Arleta, California home. Doctors told Carrie that Keenan wouldn't live to see his first birthday. Determined to not give up hope, Carrie, a florist by trade, turned to her herb garden to help Keenan deal with his diseases. Keenan beat the odds and is now a strapping 16-year old who wears a size 15 shoe and stands at 6 feet tall. Keenan has been able to keep his health in check, but keeping the house hypo-allergenic for him has been a problem. So, the team of ""Extreme Makeover: Home Edition,"" in an episode airing on SUNDAY, MAY 16 (8:00-9:00 p.m., ET), made a house call. Their mission was to prescribe the right antidote for Keenan by eradicating the black mold and providi