Why would someone with moderate hypertension also suffer from postural hypotension, leading to near many near faints? what treatment would you suggest

Different mechanisms: The body has a number of compensatory mechanisms to keep our blood pressure from dropping as we change positions from laying to sitting to standing. There are some people who have baseline hypertension, when they change positions they can't mount these mechanisms because of an underlying autonomic dysfunction, weak heart, or they may not have enough fluids in their bodies. Meds can cause this too.

Hydration: Postural hypotension occurs when your natural processes don't kick in to maintain your blood pressure when you stand up. Causes include dehydration (low blood volume), pump (heart) problems, diabetes/other endocrine problems, nervous system disorders.Taking certain blood pressure lowering medicines can contribute.Review meds with your doc, stay well hydrated, stand up slowly, compression stockings