Am I okay, is this serious?

So every Tuesday is clean day around here, I sweep all the floors, wash all the floors, clean the bathroom, clean my parents room and mine, and I vacuum all carpets. We live in a small apartment so it's not too much work or so I think... almost every Tuesday about half way through my clean day, I get extremely dizzy and lightheaded. I never used to be like this but it all started back when I did co-op at a retirement home and fainted 3 times on the last day there! Thats when this all started, all of a sudden I can't do much without feeling like I'm going to faint or throw up! Is there something going on? Is this serious? Should I see my nurse practitioner about this? Thank you in advance!
Am I okay, is this serious?
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