Hey there....
In regards to hydration: I had a similar thing. I've been addicted to Coca-Cola for the past 4 years or so (i used it to assist me quitting smoking - so it was a step in the right direction). I've recently started to replace it with water (using a step down approach - slow but hopefully more successful than cold-turkey) and have noticed how much of a difference it makes to my training.
My suggestion to anyone who stuggles getting enough water during the day - whenever you get a coffee/soft-drink or other "unhealthy" drink also get a bottle of water (this is paricularly good for office workers). The deal is your not allowed another "unhealthy" drink till the water is gone.
Personally i've found that this has helped me a lot in just the 2 weeks i've been doing it (currently doing a "lifestyle" change to improve my ability to train).
Also, if to anyone worried about their blood-sugar levels: SEE A DOCTOR.
The only way to find out if you do have a blood-sugar problem is to have an blood-glucose blood test done (at least that is my understanding).
Basically you fast for 12 hours then they give you a extremely high sugar drink and take blood samples at the 0 time point, the 1 hour point and the 2 hour point. This shows how your body processes a fixed amount of sugar over the time period. If you have any problems this will identify it and allow you and your doctor to create a plan for dealing with it.
Good luck on quitting smoking! That's a real accomplishment. I've seen people struggle and struggle and I've seen others do it cold turkey. I can't imagine how hard it is to stop.
I did have a glucose tolerance test a few years ago as I'd seen an endocrinologist (my regular physician, actually a nurse practitioner prescribed an antidepressant for my fatigue, thinking it was clinical depression.) They never called me with results so I started pestering them. Finally a nurse called me and said everything was fine (it took two months), that my fasting blood glucose was 84 (it had been 110 and I had started running and changed my diet). It was over a year later, when I visited my general physician that I found that my blood sugar had dropped to 45 at the three-hour mark. That's definitely hypoglycemia as normal levels stay about 65 or so. He was astounded that the nurse had overstepped her bounds like that.
So, I never did return to the endocrinologist's office. I'm rather aggravated with my doctor's office as well. I can diagnose myself when I have classical symptoms but they cannot.
I will say that the hypoglycemia is getting much better with intense exercise (martial arts). Much,much better. So, I am becoming more insulin sensitive - a very good thing. Type II Diabetes runs on both my maternal and paternal sides. On the maternal side, they have all been slim people, on my father's side, they generally ate a lot of sugar, lard, drank heavily and smoked heavily (bad lifestyle habits). But just being 5 pounds overweight can turn on the diabetes gene
.
I am checking into finding a new doctor, an internist.
I will drink more water, less caffeinated beverages.