Vision goes blk, dizzy, buckling/weak legs after standing up. lasts a few seconds. mild blk vision happens often when getting up. recent ekg normal.

Low blood pressure: Feeling faint when getting up or standing from a seated position is usually related to orthostatic hypotension. The postural reflexes (baroreceptors) that cause the heart to pump blood to the brain are slowed and there is insufficient blood pressure. It is caused by blood pooling in the lower extremities. Dehydration, bedrest, low B12 levels, anemia, and medications may be playing a role.