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The weakness along with dizziness
can be due to the low BP
you have.Please try to maintain adequate hydration with water , fruit juices , juices with salts all through the day .A complete diet with adequate proteins , carbs and vitamins has to be followed to maintain the activeness.
Do you have any other symptoms along with this , like joint pains
, cough , breathlessness?If so please feel free to mention and get more information.