My mother had 29 radiation sessions last month to her cheek, she had minor salivary gland cancer and surgery in January, is experiencing terribly debilating vertigo (her oncologist said it is not from treatments...sure!) Should she do her last (30th) radiation session next week or forego it? The radiation will probably worsen the Vertigo. She can't get off the bed. And, is there a medication that can help, like SERC? "Meclizine" is no longer available in Canada. Also, can the vertigo be permanent damage? Thanks.