It took me about 4 months to even accept that I had diabetes and that it wasn't just some temporary problem brought on by medications or something else. It can be a devastating diagnosis and it's okay to struggle with it.
That being said, you have been given an opportunity to significantly improve how you feel on a day-to-day basis. When you go from poor blood sugar control to good control, the difference in how most people feel is like night and day. The changes to your diet are more than compensated by feeling much better. It's hard to see that now but once you get a taste of having energy, sleeping better, peeing less(!) and reducing any of your other symptoms, it will help you find the motivation to keep up with the diet changes.
Why don't you post more about yourself, your history with diabetes, your diet and what changes you are considering making. There are some smart cookies on this forum who can help you make the diet easier and you don't have to feel deprived. Some, myself included, love the new diet even more than the old (mmmm steak!)