firstly blood pressure is catagorised in these catagories normal bp is less then 120/80 pre hypertensive stage is 120 to 139/80 to 89 grade 1 hypertension (mild ) is 140 to 159/90to 99 grade 2 hypertension (moderate) is 160 to 179/100 to 109 grade 3 hypertension (severe) is 180 and above/110 and above your daisyolic bp whether it is 90 or 88 or 82 falls under prehypertensive stage so right now for treatment of prehypertensive stage life style modification is advocated do strenous exercise daily for atleast 45min a day take low salt diet drink plenty of water add fibres in your diet if not controlled in 3months then medication will be added but if your diastolic bp is more then 90mm of hg then you should add tab amlodipine 5mg once daily and monitor bp every third day and keep a record