Please advise pertaning to my situation

i also wrote down here my doctor's inspection and his suggeted treatment as well as the progress of sympton

use feel nervous and being panic very regular. However the most disturbing sympton caused comes from my heart as the panic makes my blood pressure were getting very high.

Recently, I came to see a doctor and he advised me to go on a diet of salty food as the medical checkup revealed no physical evidence to connect to any disease. However, my blood pressure was still very high nomatter how long I try to rest, I could not pass the blood pressure measurement test

i did try as the doctor's suggestion but somehow the diet made me more drowsy and less active as I also feel lacking of energy in all of the work. I even feel that my blood pressure went down a lot slower than normal but the situation was always reversed when the clinicican measure my bp. Beside that, my body was also usually being shaked without controling when making normal interation with strangers, it was not just common nerve but also the overwhelming fear of unknown factor

may I ask what disease I am currently suffering?

Another problem involves in the reading of digital blood pressure monitor device ( I bought the model omron m2). I want to ask how to read the index on it as the doctor ussually takes the first heard stroke of blood pressure as the systolic index and the last hearing as the diastolic. However, my digital one seems to work so different although I saw the number start to flash from 140 or more when deinflating, its final result indicated my bp in the normal range (i measured at home by myself) 110 for systolic and 67 for diastolic

so I would like to know the exact method to read the index on the digital monitor?
Will it be less accurate than the mercury based one?
Why my bp stared to flash from 140 but the final result depicted the systolic as 110 instead of 140?
What is the highest pulse of a male adult ? What is the optimal value for it?
Thanks for your kind attention