How can I know when I've lost too much blood?

Anonymous
I'm on my period and and I have been spotting since last Wednesday and since Monday been having like a regular heavy period. I know I lose more blood than normal with my periods but I feel I've lost too much maybe. I'm very cold and tired feeling, almost sorta dizzy headache type deal. Sorry this is tmi but I just went to the bathroom and when I looked the water was pretty red and there was like 3 dark red stripes of blood going down the toilet that took flushing twice before they were gone. Could I be losing too much blood right now?
How can I know when I've lost too much blood?
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