I Am A 54year Old Male In Good Health Other

I am a 54year old male in good health other than a hiatal hernia (for which I take prevacid), and high blood pressure which was successfully controlled with lisinopril 10mg. until approx. 2 years ago. I began having headaches and rising pressure (diastolic seldom under 90) so my Dr. raised the lisinopril to 20mg. a day which seemed to work for more than a year. When the symptoms returned, Dr. Lancelot changed meds to Hydro(something...some sort of water pill in the a.m. and Losartan in the p.m.) that only worked for a short while. A week ago he started me on Amlodipine 10mg. in a.m. and Losartan 100mg. in p.m. Still my diastolic pressure seems to range in the 90's - low 100's.