I drink about 3 cups of coffee with no sugar everyday

As a diuretic it may cause a blood sugar rise "in some people" - data that I have seen shows that it is more common in the occasional coffee drinker then the habitual, but you have to "see" how it effects YOU

I drink between 8 and 12 coffee's a day (8oz = 1 coffee) and it does NOTHING to my blood sugar at all, but if don't get a coffee or two in me within the first couple hours of the day, I get blinding headaches (caffeine withdrawal)

No way what so ever. It's the sugars that effect your sugar level

Beverage with caffeine gives me heart palpitation. So l avoid drinking Caffeine

Caffeine makes my heart skip beats...so I do my best to avoid too much at one time