Should I listen to my doctor?

I hate going to the doctor. I went to the doctor yesterday to get checked on for this bad cough I have. The doctor said it was either allergy or viral bacteria. I just needed to get checked on for my cough, but you know how doctors are. I had to get my blood pressure checked and had to be weighed. The nurse checked my blood pressure one time only and the very first reading was 144/90. Now my doctor is telling me my pressure is too high and that my my weight is obese. I'm about 5'9 182 lbs. I'm told to get back to my old weight, which was at 150 lbs. and same height. My parents said doctors tell you that stuff so you go back and spend more money.The more they find stuff they "claim" is wrong with you, the more you keep going back and spending more money. My whole family has high blood pressure, which is hereditary for me since its been ped down from generations on both sides of the family. I'm told to eat nothing but fruits and vegetables, which I understand that part.