I was diagnosed with hypertension 4 years back. Since last year i was taking 300 mg of isrbesartan along with 12.5 mg of hydrochlorothizade.my bp was well controlled ranging around 125/80. I started working out and has reduced my weight by 10 kgs, by dosage went from above mentioned to only 300 mg of isrbesartan to recently to 150 mg of isrbesartan, my current bp ranges from 110-120/65-75.i still over weight according to bmi, i workout 6 days a weak ( 30 min of high intensity cardio and 45 min of moderate weight training) My problem is that whenever i get up from sitting position or lying down position i feel very dizzy with sometime blackout for a sec or 2. What should i do.