28 mg/dL !!! My God, man! It is a miracle that you are not in a coma right now or that we are not reading your obit. That is hypoglycaemia, absolutely. For us diabetics, (and I'm assuming that you are), hypoglycaemia is much more dangerous than a high blood sugar reading. You probably know that a normal, healthy adult will have blood readings between 80 and 120 mg/dL. As others have said, a 20 mile ride should not have resulted in what happened to you. From now on, (again, assuming you are diabetic), and you do physical "stuff", always, ALWAYS, carry something you can eat if you start feeling weak. You will know when your blood sugar gets low. You don't need much to bring it back up. Even something as simple as a granola bar. Something!
I'm serious! This is dangerous stuff. Get into your doctor ... as soon as he can fit you in. You can probably still ride, but as I said, carry something to eat if you start feeling weak. Good luck.
(disclaimer: I am not a physician, but speak from personal experience.)
Last edited by volosong; 08-14-12 at 10:10 PM.