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You need to confirm you don't have something called Orthostatic hypotension
which is low blood pressure which occurs after standing. You need to confirm that by your Doctor since if you aren't able to walk. Avoid eating a lot of salt without confirming your problem. You can get an ultrasound
to see if you have any adrenal problems as these can cause low BP. Also autonomic disturbances can. Do you have Chest pain
. How is your Haemoglobin
level. Any other problems, like bowel and bladder disturbances.