Buckles There was some good stuff posted upthread, or might have been on week 1, about the body’s reaction to the death throes of yeast dying off as a result of a low carb diet. The gist being that when the sugar train stops, the Candida flares up in protest and makes you feel rotten before whimpering away. To. It’s. Death.
Very interesting stuff. I’m hoping it helps my problem.
It’s similar to the theory that because our bodies’ store toxins in our fat cells, when we burn fat, those toxins are flushed out at the same time. This can make you feel a bit rough and things can flare up including bad skin (etc.) while this happens. Apparently it can also account for some of the extra whiff emitted through pores.
It’s sounds very similar to the Candida/thrush theory in that the symptoms are a result of the body purging itself of all the badness and side effects of a carby/crap diet. Kind of - it gets worse before it gets better and so on...
I’m now telling myself that this is why I’m having the mother of all colds 
. Am thinking of the ketones and trying to stay zen.
There was also some very interesting stuff on the last boot camp about how the body enters repair mode on this woe (which it suggests can account for lack of movement on the scales while it holds on to water/focuses on healing during first few months).
So perhaps your body is looking at that old Achilles injury, and your griping back too, causing a little discomfort in the process?
I think insomnia is quite normal for some people at first. Generally though, after a while the majority tend to experience better sleep quality. So hopefully that will be short lived for you too?
*I am no expert I just like to tell myself that everything is a sign of something good happening 
even if it’s only wishful thinking The power of positive thinking and all that!
(Obviously this doesn’t mean ignore or dismiss things if they persist and you are uncomfortable, or you really suspect something is wrong)