My mother,69, has had burning mouth syndrome for years. She takes Benadryl twice a day for this as it seems to help. She has had sporadic esophageal spasms once every few months. Also every few months she has times where she is lightheaded for a few hours that gets worse until she just goes to sleep. She does not get sweaty or flushed, just off balance. Then she feels better after a few hours of sleep. Low blood pressure runs in family. She will not go to the dr. Could the dizziness be caused by the antihistamines?