Hi,
Welcome to health care magic,
I have read all your history and questions.
All these symptoms of your mother might have caused your
lightheadedness.
Stomach upset,gas and bloating is likely due to
gastroenteritis or
irritable bowel syndrome or
acute gastritis but here there is no need to worry as it can be cured by medications and diet.
Slightly slurred speech must be evaluated further to rule out any neurological cause even if the New York doctor's have ruled out stroke.
She should go for routine blood tests and stool examination with ultrasound abdomen.
And take antacids (pantoprazole) available over the counter with antibiotics (ofloxacin with ornidazole) and symptomatic treatment.
Avoid oily,spicy and non-veg foods for at least 3 to 5 days and must not take alcohol.
She will feel better within 3 to 5 days of this medications.
If symptoms persists then she must be taken to the
neurologist for slurred speech and gastroenterologist for gastric symptoms whi will know about the tests and appropriate medications.
Regards,