Crunching Ice

ok of all the crazy things… the only thing I can find to do when I want something to shew on… is
Crunch crushed ice. No carb,no calories. No problems? hmmm… I’m told that if I’m crunching ice it is because I need to be on medication for anxiety or depression. How can that be?
I’m crunching ice to avoid a high blood glucose number. Why cant anyone understand that?
What else can one do?