i know what u mean about feeling light headed and sick and then eating. i am anorexic-bulimic. my parents dont know but soon will. when i get light headed i drink propel. it has electrolytes so it will keep u hydrated. i hope u are feeling better. if u cant work out then try walking or power walking to lose weight. i ride horses but as i recall u said u have back problems. hope u are well! (((((hugs)))))