Thank you for that additional information.
The lightheadedness could be due to many things....some of them no big deal, and some of them an emergency.
The safest thing to do would be to have someone drive you to the ER for a quick going over to make your heart is ok and your basic labs are fine. If needed, they can do specialized testing and imaging.
If the is has been going on for a while and has not been getting worse recently, it wouldn't be unreasonable (if you do not want to go to the ER) for you to see your primary care MD in the morning.
Does this make sense to you?
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Dr. Rick MD FACS