I am a 14 year old male, I have two questions.?

The first one is that when I stand up too fast, my vision gets blacked out and I have trouble staying standing up I also sometimes get a bad headache on the sides of my head, this only lasts for like 10 seconds but it happens frequently. Is this normal? Second one is when I am sitting down sometimes for example... show more The first one is that when I stand up too fast, my vision gets blacked out and I have trouble staying standing up I also sometimes get a bad headache on the sides of my head, this only lasts for like 10 seconds but it happens frequently. Is this normal? Second one is when I am sitting down sometimes for example just recently I was sitting down playing a game on my computer and all of the sudden I get a SHARP pain in my ankle like someone just shot me there. Is this normal? Do I have to see a doctor for any of these?
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