Should I go to the doctor or is this normal?

queen-b
Ok I'm not good at explaining, but ill try.

Anyways I sometimes feel like ill get blind suddenly ,

Cuz when I lay on bed on my stomache , I feel pain in my head and I feel like my head is heavy and it gets dark like blind dark , and it hurts my eyes, ... And sometimes when I stand up quickly, it gets dark,...

It freaks me out,...

Is this normal , is it high blood p, or what...
Should I go to the doctor or is this normal?
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