Fluids & salt
Blood pressures 90/60 or less may be normal for many people unless they develop it suddenly or recently.
If the blood pressure
was high or normal140/89 for no diabetics and 130/ 85 for diabetics and now is low could be secondary to dehydration
, bleeding ( hidden bleed) or medications. Try fluid intake, increase sodium intake, elevate legs at the level of the heart
for 30-45 min several times a day.