I had days when the SWF (Salt-Water-Flush) didn't work, just do it again the next day.
PMS, I just had mine, I was very VERY tired, I really had to take it easy.
If you not worried about weight loss, I don't think some extra MS would hurt.
I drink my lemonade with only 1 tbs of MS. I don't like sweets too much.
Just think of how the fast is something you want to do not something you HAVE to do.
Like a gift to your self.
You doing good, no major demage done, keep fasting. I'm on day 38 and it's well worth it.