Hello CT! I am sorry to hear about the diabetes. However, I can really empathize with you as I was told the same thing this past summer and it really hit me hard. You and I sound so alike - I too have high blood pressure/hypertension (abbreviated HTN). I developed HTN during my last pregnancies, in my early 30's. My doc had to pull me out of work in my 20th week and then my pressure was normal. However, not long after having the baby, my blood pressure went up again high enough I had to go on medication. And yes, I too have a high cholesterol level. My ECG's always show quite a few PVC's - premature ventricular contractions. I went through a very thorough cardiac work-up and they couldn't find why. Sometimes people just have them and they do no harm. I am one of them.
First of all, be gentle with yourself and let this sink in for awhile. Believe me, freaking out doesn't help. That's what I did at first.
You have a tremendous resource right there in front of you - the internet. Great sites for diabetics to learn and places offering support, if you need it. There are also tons of books out for type 2 diabetics that explain the disease and also tons of cookbooks for type 2 diabetics.
I saw my doctor and he put me on medication for my cholesterol and for the diabetes. They also gave me a home glucose monitor. so I could keep an eye on my blood sugars. With regards to my diet, I just started eating better and paying closer attention. Drinks like Crystal Light are great. It's made with Spenda and doesn't taste diet at all. So, there that helps you get in your needed water intake everyday. Weight Watcher's has a line of diet sodas that are delicious and don't taste diet either.
Keep a diabetic journal. I take my medication when I get up and I test my blood sugar and log it. Two hours later I re-test and log it. Then I write down what I ate for breakfast. I write down what I ate for lunch and test my blood two hours after and log it. Then I take my medication again around 5pm. I write down what I had for dinner and again test about two hours after and log it. Doing this I can see if my sugar is high after a certain meal, I can try and see what I ate that may have caused it.
My doc re-tested my blood six weeks after the diagnosis and my blood sugars were in the range of a non-diabetic's. My cholesterol went from 314 to 177 and my bad cholesterol (LDL's) was 88. All excellent.
Like you, I have issues with exercise as I have fibromyalgia. During the warm weather I swim in our pool. Other than that, I just try and be as active as the fibromyalgia allows me and I take it day by day. Swimming and water exercise would be excellent for you as the other poster mentioned.

You're not a mess. Everything will fall into place. Humans have the greatest ability to adapt. You will adapt.

When I look at things, I don't see my lifestyle having changed that much. I incorporated changes into my lifestyle.
Now, I only have to test my blood sugar a couple times a week instead of four times a day. I've lost weight with my better diet and my blood pressure is wonderful. My doc said if I keep it up I may be ale to get off the blood pressure medicine.
If you take your blood pressure medicine, do what they prescribe for your diabetes and also probably take a medication for your cholesterol, soon you will be feeling a whole lot better and your numbers will be better too. I didn't realize how crappy the diabetes was making me feel until I got my levels normalized.
Take a deep breath and take things moment by moment. You're going to be fine.