Jill, any time you become fearful of “taking control of something you’re so attached to and have relied on” – bring yourself into the present time and be willing not to know how things will go in the future. You seem to be assuming a once-and-for-all decision – and that will inevitably set up resistance, self-sabotage, and rebellious overeating.
Better to take all this on with a view to try it out and see what happens, and if you don’t like it you can always go back to your old ways. It will take off a lot of pressure and anxiety.
The future doesn’t exist. Not only that, but you can only know for sure what food choices you’ll make in the present time.