Hi Jeanne! You've gotten lots of good info - and boy can we all relate to it being overwhelming. Hang in there and as Sienne said, we'll help you find the right info that you need at the right time. I'm sorry your cute little Nuggie is having a bad time. My high dose cat, Punkin, had acromegaly (benign tumor on the pituitary gland). Punkin passed away a little over a year ago.
We love our little ones so much.
There have been cats here with Cushing's, although it is far less common than acromegaly or even iaa (insulin auto-antibodies.) If there is a question we don't know, there are folks with experience with Cushing's that we can get to help you. Linda/Bear Man is the most experienced, probably, and she just became a vet tech recently after all she learned with Bear Man. At the moment she's on vacation, but I'm sure she'll stop in to meet you as soon as she can. Wendy has also been doing a lot of recent research on the high dose conditions and has a wealth of knowledge on them.
The primer on pancreatitis that wendy gave you is a great resource to make sure everything possible is being done to help Nuggie's pancreatitis and to help you know what to ask your vet about.
Please keep asking questions. We're here to help you find answers, but we're also a great supportive community. You don't have to go this alone.
Edited to add (because I always think of more to say):

by the way, I agree with Wendy about staying at 10u per shot right now. You're right that you'll see the best numbers and be able to figure out dosing if you stay at one dose for several cycles. Changing doses is a bit like rocking the boat - you've got to wait after you change to let things settle down so you can see what's going on.
I'd also switch away from the AT. In no time you'll have made up for the cost of getting a new meter with your savings. AT strips are the most expensive. Freestyle lites aren't good for cats - i used one - they measure the blood differently and you won't see the high numbers that are there. I'd stick with one of the ones that Ann & Chris are suggesting, but i don't think it matters much which. Human glucometers are completely fine and so much cheaper to use. For the cost of 1 AT test strip you can do 4 tests on the human glucometer.
Then I'd also try to get at least one test in the pm cycle because we do see many, many cats have their lowest numbers at night. Because Lantus dosing is based upon how LOW the dose takes the cat, not the high numbers, it becomes important to catch the lowest numbers.