Glad you are feeling less headachy, drinking more has obviously helped.
Dark Choc is allowed, but I would have thought 4 chunks is perhaps a bit much. Could you cope on just two? And be sure to count the calories and if you are doing it, carbs as well. I look to keep carb at 50g or under per day, but I don’t track protein intake. There are apps some people use, which gives guidance on all aspects of daily intake, but I have found tracking calories and carbs enough to keep my on track and losing, so don’t feel the need to make things more complicated.
Some people on the forum are using porridge oats. I personally think they are too carb heavy, but use them if you need to, keeping portions fairly small and counting cals of course (and carbs if you are doing this). It must be difficult on the BSD being vegan, as it knocks out the usual protein sources. Tesco stock a range of vegetable protein powders – have used the Hemp one. That could be a way to boost your protein intake without adding too many carbs. It can be added to shakes, mixed in with soy yogurt etc.
Hope at least some of this is helpful – good luck!