Please..if u could help me and my daughter with this Q..She is doing radiation treatments after surgery for brain tumor at base of her head..Trouble she's having is Passing out during treatments..she is convinced it's because Mucus she has in head..and when they lay her flat..to head gear up etc to do treatment..she feels this causes her to pass out..any thoughts would be greatly appreciated. HER Surgeon says he never heard of passing out w radiation treatment?