Hello! Thank you for asking on HCM! I understand your concern and would explain that your repeated vomiting may be related to a gastro esophageal disorder (like hiatal hernia, refluxor esophageal spasms). Is your vomiting related to your headaches? A raised intracranial pressure could cause headache and repeated vomiting. The episodes of dizziness while standing up seem to be related to low blood pressure or orthostatic hypotension, caused by dehydration. I recommend consulting with your GP for a careful physical examination, a fibrogastroscopy and some blood lab tests: -complete blood count -thyroid hormone levels - blood electrolytes - kidney and liver function tests, etc. A brain CT scan may be needed if suspicions of a raised intracranial pressure are raised. Hope to have been helpful! Greetings! Dr. Aida