What Is Causing High BP?

Hi, I m 39 years old. I suffered since one month from a fast heart rate over night, this was accompanied by bloating stomach and gazes. It stayed like around 3 hrs and then it went away. The same case was repeated one week ago but not strong as the time before and not accompanied with bloated stomach. this last time happened in the morning where I have been in my office. Note that I have GERD and I m on nexium 20mg daily. I went to a cardilologist who performed an ECG and said that it is sinus trychardia due to high blood pressure. my blood pressure when at the cardiologist was the 1st time 16/9, after relaxing it went down to 14/9, then after performing the ECG it went down to 12/7. The cardiologist put me on a concor 5mg daily (2.5 in the mirning and 2.5 in the evening). Note that I did my labs and I got a total cholesterol of 208 ( above range by 8). No excess secretion of Thyroid gland. Shall I use the concor for ever or it is only temporary?