Why do I feel weak on my period?

Anonymous
When on my period (the heaviest couple of days) If I'm standing for more than 2 hours straight I start to feel weak. At work I have to be on my feet the whole day, so sometimes I have crouch down on the floor for a few minutes because I feel like I would pass out if I don't. Is this normal? What can I do to help it?
Why do I feel weak on my period?
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