What you have is probably postural hypotension. The blood pressure falls when you stand and causes all the symptoms that you are suffering. Dehydration, certain medications, heart problems, untreated diabetes, and nervous system disorders can all cause this. TIAs or transient ischemic attacks can also be the cause. Certain epilepsies too behave this way with temporary blackouts. Certain internal ear problems can also affect blood pressure monitoring by the body by not properly signaling a change in position. Blood pressure monitoring, tilt table test, EKG, heart echo, ambulatory blood pressure recording are all required for diagnosis. To begin with make a conscious effort to drink fluids (not plain water but juice, lemonade, soups, herbal tea, etc), and eat at regular intervals. Normally this helps. If it does not, then you need to consult a doctor and get all the above causes ruled out. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
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