Could bp drop to 85/69 just from not eating enough during the day? bp was 85/69 pulse was 113 i panic put salt in mouth and bp went 113/85 pulse 120

Low blood pressure: Not taking enough fluid can cause this . It is similar to dehydration. You need to hydrate yourself by drinking a lot of fluid with electrolytes in it such as Pedialyte , gatorex etc. for the acute treatment. Eating complete meal with fruit and vegetables 3 times a day is the way to go for you in this situation to build up your blood pressure. Take at least 6 cups of liquid a day.