Hi berri, good on you for taking this positive step towards health. I did the same thing at the end of August last year. I was also overweight from eating emotionally and that particularly after my second marriage ended.
But like you the immediate goal was to regain health and to become more active again without that activity endangering my health more. I always kept my fast lengths open ended so that if anything happened that forced me to end my fast early it wouldn't compromise my goal of getting healthy again. To that end I focussed on how I would break each fast rather than the length of the fast (or how much weight I was losing) itself. I have been successful up to date in losing 40 kilos and keeping that weight off. As well as changing my diet completely to mostly raw foods.
My advice is that if the cravings are getting too hard to bear and you feel like you are in danger of caving in and breaking the fast, don't keep trying to fight the cravings, change them! Instead of thinking about your favourite junk food think about the fruit that you most want to break your fast with, so that if and when you do finish your fast it is broken properly.