Hi Waratah!
I have had the same problem myself, a sort of diet fatigue perhaps, and I didn't do a proper fast from early August until yesterday. I was skipping breakfast some days, possibly lunch others, but overall stopped my pretty consistent weight loss of a pound or more a week. At the moment I think I am a little heavier than early August.
I've lost a lot of weight since starting 5.2 and look a lot better so I think I just rested on my laurels.
However I am still carrying too much weight and really want to hit my target of mid-high bmi for my age and height, which gives me another 19 pounds to go.
At the weekend I went clothes shopping for autumn/winter trousers and realised that the size 14 trousers I was sure would fit were much too tight round the tummy, although as I was a size 18/16 when I started this is still an improvement. But I realised I had been doing such a great job in the first few months that I was now in danger of self sabotage so have given myself a good talking to and feel more positive about continuing. Not overthinking it,
just doing it, like I did when I started.
Try to relax a bit around it, but be realistic, and know that although 5.2 does work, it only works if you actually do it!