Hypertension. According to nephrologist?

I'm 20 years old and I'm suffering from Hypertension since 26 December 2017 when I have checked with my family physician it was 180/100 he said because u are anxious it can be normal and after 30 min it came 160/80 and after 2 hour it was 140/90 and ecg revealed Sinus Tachycardia around 120-125 beats as I was having occipital headache very badly then doctor had started Met Xl 50 he further send me to a Cardiologist my lipid, usg, thyroid, renal profile, 2d echo done by cardiologist himself all came normal and he has prescribed Betacard AM once a day in night after taking this my BP is 140/90 in his clinic and pulse is 65-72 most importantly I have got rid of my headache. But my renal Doppler is showing high PSV in renal artery and my cardiologist want me to undergo Renal Angiography and after this I am hesitating to visit him but i am continuing his medicine. Should I undergo Renal Angiography according to my cardiologist or CT Renal Angio according to Nephrologist??