pressure was 176/110 Why the sudden and drastic jump?

I am 42 year old male. 6'2" 265 lbs. I was at the Dr. to renew Asthma medicine prescriptions in January.(Singulair, Advair, Flonase) I have been taking them for years. My blood pressure in January was 110/70. It has never been more than 120/86 (when I had gained some weight). I went for a physical 2/22 and learned my pressure was 176/110. Between visits, there were no changes in my diet, medicine, personal or work life or any other tangible thing I can think of. What could have possibly made my blood pressure so high? I have been checking it every 2 days and it is slightly down to 151/92, so it's still high. I have lost 15 pounds since my phyical as a result of dieting and fear (down to 250 lbs. I should still lose 25 more anyway). I stopped eating salt, caffiene and have been eating ultra healthful since. Why the sudden and drastic jump? I have been feeling great too. I don't have any explanations. I have another Dr. appointment scheduled and awaiting Echo results.