My vision keeps going black and have ringing in my ears?

Anonymous
So this has happened to me three times. The first two times, I was on my first day of my period, so i had the worst pains. It was when i woke up in the morning so I was hungry as I hadn't eaten. I got up to go to the kitchen when my vision went dark grey and spotty and i was losing balance and had ringing in my ear. I figured it was from lack of energy from my hunger plus my period pain.
Yesterday, i was on my last day of my period. No pains, I've eaten. I had one glass of wine in the afternoon and my face went really warm after it. I never drink. I had a hot/ warm shower and suddenly my vision went really dark and could barely see anything besides these spots. I could see silhouettes of the room items. I was dizzy and losing balance. My face was pale white and my lips went from pink to skin colour. My boyfriend said i looked white. He carried me into bed and put a pillow under my legs to elevate them. This helped blood flow back down to my head. I was fine an hour after that.

I just wonder why that happens? I thought it was the alcohol as i never drink. But i read about prthostatic hypotension on line.
My vision keeps going black and have ringing in my ears?
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