my blood pressure is 120's sometimes 130's over 70's.... as the day progresses by bed time my blood pressure rises to 180's over high 80's. recently it was 199 over 96. I went to ER,,,,they did ekg, blood work and could not find reason except the doctore said old age,,,,,,I am 72 , take no meds and in very good health otherwise.......what causes the BP to rise to those heights.