People used to ask us if we were twins.When Kyla first started showing signs of illness, including nausea and a severely bloated stomach, she chalked it up to normal college-student fatigue, said her mother, Shannon Brown of Fernandina Beach.After a few months, Kyla no longer could ignore her symptoms, and in May 2008, she was diagnosed with a Sertoli-Leydig cell tumor, a non-genetic form of ova