Was wondering if a routine CBC will show if I have diabetes. My mother and maternal grandmother both had adult onset and started with pills, which progressed to insulin. For last 10 months, I've had strange changes in vision which are constant. Vision is shaky and vibrating kind of. Sometimes worse than others, but always slightly off. Have had an MRI of brain, all OK Yesterday, 3 times-2 1/2 hours apart, I have been overcome with extreme dizziness. I am a college professor and was in class two of the times, and driving home on the Interstate the last time. It seemed the room was spinning. Thought I was going to pass out, but held on to desk. Then, on Interstate, could ardly stay in my lane. Expected to crash as couldn't stay in lane and tried to exit. I did and pulled off, and like the two previous times, it only lasted 1 minute max. Then, I was OK. The first time, thought it was because needed food (had eaten 5 hrs. earlier), but second time was 2 hours after lunch and third time was just after eating a Snickers bar. Probably not diabetes, but can you help?