I agree with everyone who has said that different diets/lifestyles work for different people. I'd also say that different things can work for an individual at different stages of their life. Also, most diets and fitness regimes are really hard at first but you just have to persist for a week or so and they get easier.
If you can't cope with dieting, why not try to eat a bit healthier and mainly focus on exercise? I lost a lot of fat in the run up to my wedding when I did exercise every day- mainly shred DVD and running. Dropped a couple of dress sizes. Don't weigh yourself if you do this though, because you gain muscle which is heavier than fat.
Any calorie restricted diet will reduce muscle as well as fat, so keep that in mind. The 5:2 has been shown to reduce a much higher fat percentage than other diets.
A friend of mine has had great success with slimming world, because you dont have to restrict quantities of certain foods so you nev go hungry. Maybe that would suit you? You do have to restrict fatty and sugary food, plus some carbs like bread, but she's found that it has fit really well into her life and the whole family is eating more healthily than ever.
Another thing to try is something like my fitness pal, which really motivated me to lose about 2 stone after having my 2nd baby. You have to weigh things, look at labels etc, but it re educates you about portion sizes, which can be helpful when you are no longer dieting. It also shows how much you burn when doing physical activities, so you can 'earn' treats etc and not feel guilty!
I'm currently trying the 5:2, which suits me at the moment. I'm generally feeling a lot healthier for it, and you can keep headaches at bay by drinking a lot of fluids. The mantra is 'mainly plants and protein' for fast days, so it promotes general healthy eating. The first few fasting days are pretty tough but it does get easier. I'd advise easing in gently - start with 1000 cals on fast days and then reduce down bit by bit.
Good luck with whatever you decide!