Congratulations on your decision to take charge of your health.
First of all I would encourage you to follow the directions on your monitoring device to a "T" to be sure you are getting accurate readings. Secondly, take your blood pressure at least twice a day to get a good overall average score.
As you probably know, 90 for diastolic is borderline high so measures to reduce it such as you are doing with salt intake reduction is good. You can also benefit by increasing the amounts of calcium and potassium rich foods (fruits, fish and oats are good here). Avoid eating saturated fats. Don't eat "hydrogenated" anything or trans fat (TFA). Avoid caffeine, get sufficient rest without oversleeping. Regular exercise is also good and losing even 5 to 10 lbs can make a difference if you are at all overweight. If you smoke, quit. Don't wear any tight-fitting clothing, including socks. If you get an indentation where your socks have been, they are too tight. It can take several months to notice a difference but even if you can lower it just slightly and it takes a year, you are going to be in better shape next year than you are now.
Some hypertension is just genetic and in spite of good habits, it still requires medication. That doesn't mean you should throw in the towel. These health improvements will still reduce your risk of disease in the long run.
The answers in online forums are for information only and are not intended to substitute for medical advice and care. Please see your personal health care provider for further evaluation of your individual case.
Debbie Miller, RN