High on Water
My very first fast was in the year 2000. I remember it very well. I cannot say that you will have the same results, but that first fast of mine was 13 days long.
I had all kinds of problems back then (I turned 43 early that year).
Day 9 I awoke with no pain anywhere.
No low-back pain
No foot pain
No arthritic pain
No neck pain
Let's just put it this way; I wasn't bawling because I was SAD!
I pray for the same for you.