I second the advice about telling them that you have been advised to check your blood sugar before you drive. I believe that (for me at least) this is essential. Gp's have a tough job, but I am sure that they wouldn't want a car accident on their concscience.
I am lucky, and my GP is genarally great. A few months ago, I had a full blown hypo, right outside the GPs surgery, and he came out and injected me with some of that injectable hypo stop. Since then, he has been fantastic.Maybe he hadn't seen the consequences of what could happen, if we don't know what our blood sugar level is before? I guuess in his training, he maybe saw hypos when an ambulance crew, friend or the diabetic person themselves had taken measures themselves, but in my instance, he was the first there. The reason for my hypo was that early pregnancy seemed to make my hypo symptoms disappear....very scary, but thankfylly they are back now.
Not recommeneding having a hypo and fitting in front of your GP just to make a point, but a more gentle reminder of the consequences of what can go wrong wouldn't go amiss?