Kinda anxious. To have a second opinion?

Hi !! In the past I do have a normal blood pressure that has a reading between 120/70 to 130/80 or 90. However, about 5 days ago, my uncle (which is a doctor) while checking my bp saw that I do have an elevated bp of 150/90. Actually I am also on a diet since I want to lose belly and weight, right now he told me that I need to take Losartan until my bp drops to normal... I just want to have a second opinion regarding the meds that I take. Should I stop taking Losartan once my bp become normal and manageable? I mean should I follow his advice? next what are the dos and donts during weight lose? in the past I weigh about 230 lbs but right now I am about 202 or 205 lbs (gonna measure my weight again this weekend)? You're insights will be appreciated. I am kinda anxious right now especially when he told me to take Losartan and saw its side effects of anxiety. =( I'm just 29 years old.