Welcome to the forum Narelle, and it's great to hear that your change of diet has helped you so much
That said, as far as I'm aware, there's no evidence that dietary changes (outside of ensuring sensible nutrition) can reliably treat ME/CFS (although it can treat other allergies and food sensitivities, or issues like GERD, which are all well worth treating). I'm a vegan, have been for years (bar a teensy, tiny bit of egg in the gluten-free bread we eat, as gluten and me don't get along), and haven't noticed any significant change in my ME/CFS symptoms (and I'm very careful to ensure adequate levels of protein (including different types), calcium and so on.
So while I definitely wouldn't discourage anyone from trying a vegan diet (noting, as River well says, it's important to be nutritionally aware - although with ME/CFS I think that's a good thing to be regardless of diet of choice, and it's not that hard to eat well and healthily as a vegan), I think it's important if other people try it, that their expectations are appropriately calibrated.
