Hello,you mention that you have
asthma and you take
steroids and antihistamines drug to control it.
Your blood pressure is 180/80 mmHg that is high.
You have to control it.You have to start
hypertension drug under your doctor 's suggetion.
You have to start regular exercise.
Avoid fatty food and junk food.
Control your asthma also it also affect over blood pressure.
Use low fatty oil like sunflower oil.
Don't Take too spicy and oily food.
Regularly mesure your blood pressure.
Take fress fruits and green vegetable.
Use a law salty food .it help you to control your blood pressure.
I hope my answer helpful to you.
Thanks.