Why is everything spinning around all of the sudden when I stand up?

My aunt went to pick me up from work after I called her. Last week I was on a five day fasting then this week a 4 day fasting Last night I my vision was off that everything was spinning around and I almost felt but my aunt was hable to cought me I was conscious of my what was going on. It stop once my aunt set me down on the couch and a glass of water made the spinn8ng Stop. I didn't think much of it I blame it on just being tired. Now I am at the hospital doctor is running some test and yet I have not received an answer as to why when I rise my vision spinns around. What could bebthe reason? Its been hours since doctor took some blood test still no answer at all.

Why is everything spinning around all of the sudden when I stand up?
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