Hello Brucester,
Vilang commented in this thread that you are drinking between 2 to 4 liters of water a day, which can easily create an abnormal demand and strain on your kidneys. The body can only use so much water and any taken to excess is eliminated and even inhibits/prevents the elimination of bodily toxins, and where
Shelton commented (and where he also quoted from others) that this was their experience.
To ease this burden I would only drink water according to thirst and that should ease this burden. It is also quite common for fasters to need less water as eating demands more fluids: on both of my own prolonged fasts, my own demand for water was quite minimal.....some days more than others, but on average I drank less than one glass per day and some days none at all.
If the feeling of extreme weakness is prolonged, this can be a reason for ending the fast, so if it persists, I would most definitely consider breaking your fast.
Read this chapter very carefully.............
http://www.soilandhealth.org/02/0201hyglibcat/020127shelton.III/020127.ch25.htm
and........
"Great Weakness: This is not always a danger signal; but may be in some cases. Although it usually causes the practitioner to terminate the fast, this is due more to fear on his part than to any actual danger to the patient. Persistent extreme weakness is more likely to prove a danger signal, although this is so rare that I have seen but one such case".
http://www.soilandhealth.org/02/0201hyglibcat/020127shelton.III/020127.ch28.htm
NAUSEA.................
"Nausea: This seems to be an expression of a sudden decrease of the normal tension of the stomach. It may be induced by a foul odor, a bad taste, a disgusting sight, or an emotional shock. Severe pain, illness, fatigue, rapid descent in an elevator, etc., may produce nausea by lowering the tension of the stomach. These things bring about a loss of tension through a complicated "reflex" mechanism.
Continual emotional disturbances, such as prolonged worries, anguish, grief and repeated shocks, may result in a persistent loss of tone in the stomach and produce the "all gone" sensation or vague nausea often complained of.
In many cases there is no doubt that the sudden withdrawing of all food, as in fasting, results in a temporary lowering of tone or tension in the stomach and this produces nausea. On the other hand, tall, thin, undernourished people are likely to suffer with a chronic lack of tension in the stomach and this becomes more noticeable when they fast. The presence of bile in the stomach also causes nausea. Its presence is very likely to lead to vomiting".
I also suffered with nausea for quite a number of days towards the end of my first prolonged fast of 25 days, and is nothing to be overly concerned about: a horrible experience nonetheless.!!!
Lower back pain is probably caused by your kidneys working overtime thru excess water.
Genuine hunger is persistent, and does not go away: the demand for sustenance intensifies with the passage of time over a few days, so if this is the case, do not hesitate to break your fast, as this is the MAIN SIGNAL that your fast is ended and where you would soon enter the period of starvation thereafter, which is not recommended.
Regards
Chrisb1.