I'm sorry you are finding it so frustrating! I think the 5:2 premise is (or should be) that you can eat what you like, but perhaps not as much of what you like as formerly. The diet was developed based on a sample of 1 (or 2 if you count Mimi Spencer) and of course, while for some people it works perfectly, others need to be a little more careful. I think this is where Krista Varady's alternate day diet works better because very few people can fail to lose weight with fasting every other day.
After a year of fasting, my appetite is so reduced that I am happy to leave out the bread, potatoes and rice from my diet so that I have room for a piece of cake or chocolate. I don't feel deprived because I still get to eat some treats. So I don't think you have to cut out all enjoyment, just perhaps, gain a degree of mindfulness. I would guess that with continued fasting you would find your tastes and appetite changing in any case, but because of the blood pressure issue, you are, understandably, keen to get a move on with making progress. Once your appetite and tastes start to change the weight will come off faster. Indeed you say your appetite is already starting to reduce.
From the science research I have read, it seems that the good effects of fasting come from a) the reduction in total calories and b) the reduction in carbohydrate intake during the fasting process. This is why I suggest cutting down on carbs on your feast days as well as the fasting.
So, what I do is to cut out the carbs that are basically 'filler' and keep the carbs from fruit, root veg, cake, chocolate, wine, resulting in a much reduced overall carb intake but still plenty of nice stuff! By skipping breakfast every day I was also able to cut out a load of carbs that I would normally have eaten at breakfast (cereal, toast etc). You can see that I have increased the amount of fasting by skipping breakfast and cut down on some carbs...a combined approach.
You need to find a method of fasting and feasting that works for you, so I'd recommend experimenting to see what kind of system will fit best with your lifestyle. Once you know the basic rules: keep insulin levels down and keep calorie intake lower than your daily energy needs you have the tools to work out the best method for you.
Finally, I'm not sure if I've already posted about this on your thread, but the saturated fat issue is context dependent. If you have a high carb diet, then saturated fats need to be kept down so as to allow you to have the required intake of unsaturated fats. If you have a lower carb, higher fat diet, then the extra fat can be taken as saturated fat because you only need a finite amount of unsaturated fat in your diet.