That's a very interesting personal experience description. Never tried fasting before but after reading your post I may decide to try it for a while and see my body reactions. I have been into mindfulness for quite a while after discovering a free online 8 week course from Dave Potter
I was also part of a group which helped translate the Spanish version of the course
It was a great experience and ever since then I try to do my 10 to 20 daily minutes, I have experienced some of the emotional reactions you describe.
Thanks for sharing