I Was Asleep One Day.. Out Of Nowhere I Woke

I was asleep one day.. out of nowhere I woke up with a fast heart beat dizziness felt all most like a heart attack..I didn't go to doctors because it went away fairly quickly. ..I believe it was tachycardia after I Google my symptoms..started to check my blood pressure every day it was in the 130 140..sometimes 115 120 I felt fine but it would spike up again ..8 days later I went to the doctor because I wasn't feeling 100% my blood pressure at clinic was 158 told doctor about my back ground 10 year smoker and drinker I'm 26 ..not in bad shape weight 155 hight 5'6 she recommended blood test and to stop smoking. Diet no salt and exercise..I quit smoking and haven't drank much at all..I start ed my diet that same day oh i started taking garlic pills 1000mg everyday i heard it was good for bp haven't checked my blood yet ...i still check my blood pressure it's 130 145 I feel fine sometimes but then I get headaches I feel a little tightness in my chest sometimes.. is this a concern I haven't gone to check my blood going in a couple of days