Been diabetic over 11 years. I try to have tight control. I can tell when I go down to 70. Knew it when I was walking around Macy's yesterday & popped my glucose tab. Yes I correct at 70. I correct at 160, too, since 1 unit can reduce me 35-40.
The only thing that tells me I'm high, tho, is blurred vision. That's a lousy sign. Wish I could find a different one. I don't believe in the "longer you have diabetes" you lose ability to feel them. I think it's a matter of always getting quickly out of the highs and lows and sticking with 100. WYSIWYG