Hi OP,
I've been on a diet the last 8 months or so since having a baby in January. He is my third baby in 5 years and unfortunately I had gained a lot of weight over the pregnancies!
I do think I have had a long term sugar addiction over my life. The only thing that has had long term success for me in terms of health and weight loss is cutting out refined and added sugar almost completely.
I fell off the wagon in around Sep and have got back to it now. It was a reminder of how absolutely awful, mood swingy, lethargic and low energy sugar and sugar crashes cause me to feel.
Even at the beginning of my weight loss journey it only took a few days to feel like a completely different person. So it wasn't even the weight that was making me feel so low as I thought, it was the constant sugar. I went within a couple of weeks to needing so much less sleep, had so much more energy when I was awake, skin looked better and moods were more stable. Plus of course the weight waa falling off at a steady pace.
It must be an addiction for me for sure because there is no way I would have willingly given up all of those benefits unless the stuff had some kind of hold over me.
I wilk warn you I feel like shit for the first few days after giving up refined sugar. I still use a couple of sweeteners in moderation- Clark's Maple syrup which is lovely and is almost half the sugar content of sugar, and pure honey too. I also have success eating protein bars instead of chocolate bars, but the use of artificial sweeteners is questionable if you can avoid it.
Do it OP, it will make a huge difference!