i feel light headed

im 4 1/2 months post op down 90lbs, almost everytime i get up to a standing position i feel light headed,i try 2 get in at least a protien drink or 2 a day and i eat at least 1 meal,but my calorie intake is very low, im really not hungry most of the time i wonder is the light headness is caused by the fact my blood sugar gets to low.

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