Gr symptoms and conditions

I´m 55 years old, and been taking Diovan 80 gr for more than three years now. Never had any problem, and my blood pressure is really under control. But lately I´ve been experiencing dizziness.Decided to reduce the doses to half a pill per day, and felt better. Did several tests with a cardiologist, and all seems OK, except that my blood pressure was again a bit high, and he recommended me to continue with the 80 gr doses. The Doctor attributed the dizziness to low mineral water intake. So I am now drinking 2.5 ltr of mineral water a day, but besides going very often to the loo, the dizziness did not disappear. Is it possible the Diovan is the cause.