My daughter (8 years) has been complaining of abnormal vision since 2 months now. She says that occasionally her vision (i.e. eyesight) starts turning around. It happens when she is lying down and then moves her head, e.g. when trying to get up. It is sometimes associated with headache, but not always. Otherwise, there is no problem: she has a good appetite is lively, sleeps well etc. What should we do, what can we expect?