Amy, I hope it gets easier for you. With the help of many people on these boards, it has become a lot easier for me just in the 2 weeks and two days since Pumbaa was diagnosed.
The first time I tested Pumbaa...he was sitting on my lap and my knees were shaking! Now, a week and a half later, it's just a routine, with high-quality food bribes keeping Pumbaa occupied while I test him.
Mel/MommaofMuse is a wonder woman and has been such great moral support for me, as well as a wealth of knowledge. BJM gives impeccable information and advice, in terms that are very easy to understand, as well as great emotional support. Amy was spot-on, you aren't alone...we all went through the same emotional roller coaster ride. (Not intentionally ignoring anyone else...just trying to give some examples.)
The most important things I learned in the last two weeks are:
1) Too little insulin is bad over time, but too much insulin can be deadly, hence the rule -->
2) Go slow and start low;
3) Be patient. I was born without the patience gene and like instant gratification. Someone suggested I wear my "patience pants". I'm still looking for where to order some!

4) Any vet that tells you to NOT home test, or suggests you bring your cat in once a week for testing is full of ****. Find a new vet who encourages daily home testing. You will be able to much better manage care if you are doing the testing in the environment that your cat is the most comfortable in. My vet was thrilled that I would do this for Pumbaa, and she has access to my daily spreadsheet so she can track the results;
5) After a lot of research, including on these boards, I insisted that Pumbaa go on Lantus from day one, as it is a long-lasting insulin and seems to have the best history of having the cat eventually go into remission and not need insulin 2X per day (BID);
6) Do not run up the expense of your vet boarding your cat to run a curve, when you can do this much easier yourself, with less stress to the kitty;
7) Start feeding your cat a high-protein, low-carb diet, and that means no dry food. Since your kitty is already on insulin, if you haven't already done this step, you will have to watch the BG levels closely. I first got Pumbaa off of any dry food before starting the insulin, as that was suggested in
Dr. Lisa's website.
8) Rely on the people here, with their wonderful and vast knowledge, to help you through each step. They are in the trenches dealing with their sugar kitties, and have amassed a lot more knowledge about FD than a normal vet would.
(((HUGS))) to you!