Type II Diabetes when bloodwork says otherwise?

Family history: mom and all four grandparents are type II diabetics. My fasting sugar is always in the high 90s, but normal. Spot checking with a meter I bought, however, 2-3 hours after a normal meal, my blood sugar is often 150-160. My A1C is also normal at 5.5. I don't eat a lot of sugar or carbs (or calories, for that matter). I am overweight despite strict diet, and constantly fatigued. I am always thirsty and struggle with chronic oral thrush. I am nauseous in the mornings. My teeth are falling apart despite excellent dental care. I have low cholesterol and the rest of my bloodwork is normal. I take supplements, drink 80-100oz of water per day, and do not smoke or drink. I fall asleep all the time, and esp. after eating anything sweet. My facial sweat smells almost nauseatingly sweet. My urine has a rather acidic ph (5.5), and for years I've struggled with cuts and bruises that come easily and then don't heal. All the signs (in my opinion) point to diabetes, but my endocrinologist and PCP say the numbers don't match up. Should I bother with the old fashioned oral glucose tolerance test?