Having what seems to be an overactive bladder is one of the key symptoms of diabetes. Your body tries to do everything it can to get rid of excess glucose in your blood including making you feel thirsty all the time and needing to go to the bathroom much more often, including getting up at night.
Having Type 2 diabetes is a scary thing, initially. But there's a lot you can do that will make a huge difference!
I suggest that you get a copy of a book, Dr. Bernstein's Diabetes Solution. You can find it in most bookstores and in the public library. You can also read most of it online. Dr. Bernstein has been a Type 1 diabetic for 65 years and decided to go to medical school and become an endocrinologist when he was in his 40s because he'd found ways to manage his diabetes that weren't very different from the approach taken by the American Diabetes Association and other medical bodies.
Dr. B gives some of the clearest descriptions you'll ever find about what diabetes is, what it does and how to manage it. He also includes a particular way of eating that is virtually guaranteed to bring your blood glucose down to normal levels by following a carefully-controlled, very low carbohydrate diet of no more than 30 grams of carbohydrate per day. Many, many people on this board and others have found Dr. B's approach to be very useful. A lot of people find that they can eat more than 30g of carbs a day and maintain healthy BG levels, but it's very helpful to see the kinds of results you get if you follow his diet to the letter for a few weeks.
Unless you have a urinary tract infection, I imagine that the reason you feel your bladder is overactive is you're eating far too much carbohydrate and your body is trying to get rid of the excess glucose. If you reduce your carbohydrate intake dramatically, your bladder will calm down right away!
Do you have a blood glucose meter? Are you testing yourself often? Ideally, to get the best picture of how you're doing, you should test first thing in the morning, when you wake up, then before and two hours after each meal or snack. You should also keep detailed notes about what you eat and how many carbohydrates are in it. After a few days, you'll see what foods are making your blood glucose go high and which ones aren't affecting you.
Have a look at the Blood Sugar 101 website. Jenny Rhul gives great, no-nonsense advice about diabetes and how to get blood sugar under contro: test, test, test.