First of all, welcome!!!
Denise, I agree with Cora, especially if like you say, you're strict with your diet and are doing exercise. I'm on medicine and diet alone, too, but when I do have too many carbs at one time, my blood sugar will rise to 200 in a heartbeat.
When you say you're strict, does that mean you keep your meals smaller, OR your carb levels are around 35-40 for a meal? If not, try to keep them at those levels and see what happens.
Definitely make an appt. with your doctor right away, though, and talk to him/her about this. Have you thought of getting an A1C to see what your average for three months has been this time? That might be a starting point. Again, if you are being really strict, you might have to go on medicine.
Another question I have for you. Did you talk to a dietitian or work with someone who knows a lot about how to keep your blood sugar levels lower? I had no idea that some things would raise my blood sugar levels, and had to work on this for years to get my levels in control. The thing is this though. Everyone here is different in their diabetes. Some have lost their pancreatic function, or it has lessened over the years, so what works for one person, doesn't work for someone else.
I have also found that when I drink diet drinks, with artificial sugar, I crave food more. It actually makes it worse for me, especially diet Coke and diet Snapple. I also found cokes are bad for bone health, too, so only have those on occasions at parties. I mostly drink water, and some decaf coffee.
So check with your doctor, and at home, really go over what you eat during the day, which you probably have done already, to make sure there aren't too many carbs at once that you're eating.(You can go to Calorie King. Com to get carb levels. They also have books for this. I used to think having fruit was good for me, but find I can only tolerate a small apple, a slice of melons, or a few berries. Other things send up my blood sugar numbers. Good luck, and let us know how you're doing.