Visart, you don't look 58! :-) I always enjoy reading the things that Jean (LaGuitariste) contributes because she makes complex matters, like the relationship between insulin and cells, clearer and easier to understand. She knows what she's talking about!
About carbs and energy... I follow a ketogenic diet for the most part. What that means is that my principal source of energy comes from fat; the by-product of burning fat is ketone bodies, which are excreted in the urine and breath. For me to stay in ketosis, I have to eat about 20 or 25, and not more than about 30 grams of carbohydrate a day. Less is fine. More isn't! If I count the total calories in what I eat on a representative day, about 65-75% of them come from fat, about 15% from protein and about 10% from carbohydrates. What's most important in this combination is that most calories come from fat and the lowest number comes from carbohydrates. You can read alot about ketogenic diets by doing a search with Google or you might want to check out Peter Attia's War on Insulin blog. Michael Eades' blog is also a great resource--he is one of the authors of the Protein Power diet.
I enjoy the low-carb way of eating because I feel energetic, I'm never hungry, my BG is great and getting better all the time, and it's helped me to lose weight easily. For me, the critical factor is keeping my fat intake high enough. Occasionally, my weight loss will stall. Instead of losing about 1-1.5 pounds a week, I won't lose anything for a week or two. So far, that's always been because I haven't been eating enough fat. I increase my intake and sometimes cut back on protein just a bit, and I get back on track immediately.
It can take a week or so to go from mostly burning glucose to burning fat and, when you first start this way of eating, you may feel hungry, irritable or just a bit out of it--like you might if you're having a mild case of the flu or a cold. If you stay with it, most people find that they start to feel terrific pretty quickly. Eating good quality fat (saturated fat, including animal fats, coconut oil, olive oil, fish oil, etc.) is very satisfying. You'll feel full quickly. If you've mostly been trying to stay on a low-fat diet, like most North Americans who have believed that fat is bad for us, this can be a big adjustment to make. Don't worry that you'll overdo it, though. Do you think you'd ever sit down with a pound of butter and eat the whole thing in one sitting? Probably not! But a bit of butter on steamed vegetables tastes great, as does some whipped cream on some raspberries or floated on your coffee.
I want to point out that, while I'm a strong advocate of low-carb ways of eating, this is in many ways very close to the diet I grew up with and so it may be easier for me to follow this plan than it might be if I'd grown up eating lots of pasta, potatoes and rice. Many people find low-carbing to be helpful but it's not something that they want to adopt permanently. They work with their meters to find how much carbohydrate they can add to their meals without spiking their BG or gaining weight. Some people can eat a lot more carbohydrate than I can. Some find that they need to eat even less. We're all different!
One thing I've discovered is that I sleep much more soundly than I did before I was diagnosed. Before my dx, I thought of myself as a chronic insomniac. I could go to sleep, but staying asleep wasn't easy and I wouldn't say that I slept well most of the time. Nowadays, I sleep beautifully and wake up feeling truly rested and refreshed. I think it took about 6-8 weeks for me to feel this improvement in my sleep pattern.