Wow 28 days is amazing. I am on my 7th day of fasting. I have fasted a few times, no where near as much as you (my max being 11 days). I have noticed I am not feeling as great as I expected this time. Im incredibly calm and unfazed others have mentioned. But today I took a walk, and upon 40 minutes of arriving at my location I started vomiting. I suspect it was bile due to the colour being yellow/slight odour and with some mucus. Apparently this is a sign of the liver taking all the toxins out of the blood and trying to dispose of them. I did wonder if I should continuing with the water fast. I also wondered if walking up the dales put extra pressure on me and hence the reaction.
I wonder if you or anyone else can answer:
If the liver is pushing out the toxins in the form of bile then does that mean I am still in the detox phase on day 7? rather than the healing or strengthening phases?
Have you ever experienced bile/mucus vomiting? and is it okay to continue water fasting?
I hope your weakness passes, I have little advice to offer on the matter but wish you well.