Post-op Dizziness and near-fainting

I'm almost 4 months post-op. I've lost 104 lbs--down from 361. The past few weeks I've found that when I get up out of a chair, or stand back up after kneeling I get sort of starry eyed, dizzy and I'm not quite sure if I'm going to faint. So far I haven't fainted; but I fear that there's a more serious problem here. Any suggestions or ideas?

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