Tinakeji, I just wanted to throw in some info for you. I was overdosed deliberately by my doctors many years ago when pregnant with my second child (sort of as a research situation to see what would happen, and if my baby would be smaller than the usual type 1's fairly large baby). As a result, I had horrible problems with hypo unawareness for many years. I would feel very little warning and then pass out cold, coming to in the ER with an IV of glucose running. My poor husband worried about my life. Every time I mentioned this to my doctors they implied that hypo unawareness was something that happened after a person has been diabetic for a long time -- the impression that I got was that it was thought to be irreversible.
About 10 years ago, I read a newspaper article about some studies on hypo unawareness that were done in the United Kingdom. The results of the studies was that hypo unawareness is directly linked to the sugars stored in our livers as emergency sugars. When we drop low, these sugars are released from the liver to help us. Unfortunately, when our bodies tap into the liver's emergency sugars, a residue is recognized by the brain for up to 2 weeks later. So the next time a low happens that isn't fixed quickly, the brain THINKS that sugars are present because those residues are there. So we don't get warning symptoms as quickly. And it gets worse and worse until we no longer have warning symptoms.
The studies (several have been done since this first published report) all agree that if the body can go for about 2 weeks without having another severe low (severe low meaning low enough LONG enough for the body to release liver sugars), the residues dissipate and the warning symptoms of being low return. It was suggested that one way to protect our warning symptoms is to AWAYS go for the quickest possible fix to any low, correcting it before the brain has time to send to the liver for help. This means that if you are low at mealtime, you drink a bit of juice first before you eat so that quick carb can get to the problem before the food that takes a long time to digest. In the study, the test subjects elevated their levels for about 2 weeks in order to avoid ANY lows for that period of time, and warning symptoms returned.
I did this and I also changed my habits so when I drop low I always now go for the quickest possible fix rather than snacks that take a long time to digest, and my warning symptoms did return. I get great warnings now. But every now and then when I get lax, i find my symptoms not as sharp, and I have to redo the procedure (elevate for 2 weeks and make sure I get quick fixes) and the symptoms get better. We need to stay on top of it to keep our symptoms good. If you do some research, Googling "hypoglycemia unawareness," you probably will stumble across some of the reports of these studies. Fascinating and helpful to me, and I hope also to you.