A former Poland Regional High School cheerleader has sued her coach and the school district for head injuries she says she received during practice. Olivia Doyer of Mechanic Falls and her parents, Douglas and Roxanne Doyer, filed the lawsuit Tuesday in Androscoggin County Superior Court. They are seeking unspecified damages related to ongoing medical expenses. The complaint says that in March 2010, Olivia Doyer fell to the floor while practicing a stunt, suffering a neck and brain injuries, including a concussion. She told the Sun Journal, she suffered the aftereffects of a concussion, which plagued her for more than a year with physical symptoms and limited her academic progress. She said she couldn’t turn her head without getting dizzy, was bothered by bright light, and slept a lot.