By 'real' doctor, I suppose you mean a general physician; the way we see gyn's -- they are internal female specialists here in Canada. Diabetes may not be her specialty so that may be the real reason she didn't say anything; and she may think that you are seeing a general physician for those kinds of things.
The best thing you can do for now is watch what you eat; maybe check out lower GI foods: eating more complex carbohydrates (low-starch veggies and whole grain breads and cereals), maybe 2 fruit a day, dairy, and lean meats with some good fats like olive or canola oils. It may be wiser to see a dietician to get a more specific meal plan; you could ask your doctor for a referral to one at your local hospital or area.
WALKING is the best exercise to keep your blood sugar down and it helps the overall circulation in your body too; even if you only do it in 10 minutes spurts several times a day. As you already know, any amount of weight you lose is helpful, even 10 lbs. Make small changes over time so you don't feel overwhelmed and don't worry if things aren't perfect; just correct at the next snack or meal.
Your last blood sugar reading was 135 or what we call 8.4; it depends on the doctor -- but some would be concerned about that number, while some don't worry until it gets to 9 (144) or higher. The normal range here is 5-7 or 80-112. Our nurses here and my last doctor started to get concerned when I was sick and had numbers in the high 6's (90's); but illness can elevate your numbers too.
My doctor called this PRE-diabetes or Metabolic Syndrome and put me on Metformin; plus we discussed my eating plan at length and he made some suggestions where I could improve things. We were both pleased that before long my numbers were back in the 4.7 to 5.7 range; it varies depending on the day, but my main goal is to stay below 7 or 112.
Hope this helps you a bit ...