Hello dear Amjad , hi Warm welcome to Healthcaremagic.com I have evaluated your query for your father in details . * There are different causes for this much intense vomiting with giddiness - central nervous system lesion as tumor or else - alterations in BP levels - abdominal pathology - others . * Needs precise work up with physical examination and necessary supportive investigations . Wishing him fine recovery . Feel free to ask any further queries . Regards .