headache and dizziness

hi, im 17 years old and for a very long time i have gotten headaches very often and sometimes migrains but recently when i move fast or stand up i get very dizzy and lose almost all vision for about 10 seconds causing me to sit down or fall, also when i stretch i get dizzy and my head feels like it is going to explode like very quick migrain feeling, please tell me what you think
thank you

[DrNoopurMD]

Hi,

Your symptoms are suggestive of orthostatic hypotension or sudden fall in BP when standing from a sitting posture. This occurs due to peripheral pooling of blood due to which the blood flow to the brain is compromised for few seconds as a result of which one gets dizziness, lightheadedness, headache and black out.
I would suggest you to make sure that you do not sit for prolonged periods of time. Eat regularly to avoid low sugar levels and drink plenty of water to ensure rehydration.
Also get yourself checked by your GP for orthostatic hypotension as exact diagnosis can be made only after BP assessment.