Hi ShelleyGrace, you seem to be going through the same as me last year. I was exhausted and thought it was stress at work and I was selling my house but it was getting ridiculous and I was sleeping all the time. After going to the doctor extremely worried, they worked out that my diabetic medication wasn't working. I had been on metformin which did not agree with me at all on any dosage (I lived on the toilet while taking it) they moved me onto Stitiglipton which worked at first then stopped and my sugar was way over 100, I was so shocked and very upset. I have had a rather unfortunate experience with my doctor but my suggestion is do as Bubbsie has suggested, think out all of your questions and write them down so you don't forget, you need to be given some answers, regularly testing your blood sugar does help, I was prescribed a meter and strips and it really does help to known what you are eating and how it affects you.
I really feel for you because it is really scary and awful to feel that exhausted way all the time. The doctor may want to see your levels regularly and they may try other medication, which they have been doing with me for months now. I joined the forum last week and it has really helped having somewhere to vent and to people that understand and are very friendly - good luck with your appointment x