wheniwasyourage I know how you feel about 'diets' Once something is forbidden it is more and more and more 'desperately needed' isn't it!!! 
Have you tried My Fitness Pal? You simply type in what you eat after - or most of the time in my case BEFORE you eat it.
I have my usual breakfast and small lunch then I think about what to have for dinner. I type in what I would like to have and it tells me whether that is ok or not. If it takes me over I substitute 'something' with 'something else'. Sounds more complicated than it is once you get used to it.
You can also 'reserve' some calories for a little treat for the evening. Personally I love my hot chocolate during the evening - you can buy boxes of Weightwatchers sachets in the 99p shop and I find they calm my urge for that little bit of chocolate and I sometimes have enough calories left for a biscuit!
Sorry for stating the obvious if you have tried MFP but it seems to be working for me and keeping me focussed - good luck! 
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