My advice is 'Don't cut it out'
Get some 70%/85% cocoa chocolate like Green & Black, and get Highlights drinking chocolate. Put them in a cupboard out of sight.
Start the day with a good cooked breakfast. Something like scrambled egg on toast and a glass of milk. Don't have cereal or toast and marmalade.
For lunch, eat a pile of veg, and some protein.
If you need snacks, eat fruit, or maybe a few nuts. If you have yogurt, have the unsweetened greek style one. If you want to add fruit, then do so.
In the evening, eat nothing. If you are desperate, have a drinking chocolate.
If you are craving chocolate really badly, have one or two squares of the 70%.
You will be very hungry in the evenings to begin with.
After a while you'll get used to it. The drinking chocolate is junk food but it does have a bit of 'chocolate indulgence' about it.