Hello XXXXXXX
Thank you for your query.

There could be a few reasons for your pedal edema.
Simplest is, it could be positional or postural.
Of late, if you have been standing for periods you are not accustomed to, this can lead to swelling of the lower limbs.
You are hypertensive, so uncontrolled blood pressure, Or commonly, medications given to control blood pressure, can lead to oedema and swelling of the feet.
Hypoproteinemia, if you have a diet and lifestyle deficient in protein intake, can lead to pedal edema.
Anemia could be a cause.
Rarely, renal dysfunction can cause such swelling.
Thyroid disorders could be implicated.
Rarest of rare are certain conditions like filariasis or chronic connective tissue disorders.

Since the list is extensive, you need to consult your doctor for the exact diagnosis.
Till then, try napping in the daytime for a couple of hours.
Avoid standing or sitting for prolonged periods.
Continue to prop up your feet as you are doing.
Monitor your blood pressure fastidiously.
Avoid excessive salt intake.
Increase intake of protein XXXXXXX foods like poultry, eggs, milk, nuts , fish etc.

Take care, and feel free to discuss further.

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Take care
Compression stockings are fine for the short term.

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