Welcome to HCM,
After going through your history ,you are having Essential Hypertension
and taking medicines to control the Blood pressure the Candesar and Arbitel belong to same group of drug that is ARBs ( Angiotensin
receptor blockers) so do not worry at all and you can safely increase the dose to 80 mg it is more important to have well controlled Blood pressure.
I presume that your BP is resistant one as it requires multiple drugs to keep it under control please take your medicines regularly and follow up with doctor regularly.
Take less salt
By chance if there is use of alcohol or tobacco please stop both.