For the last few days I have had quite high readings of 12.7, 12.3, 11.9 my lowest reading has been 7.2 which was a fasting one, and other readings of around about the 8's, I have been ultra careful in what I have been eating, mainly salads and hardly any bread in the last 3 days, also I have had the most horrendous headache for two days now, keep taking painkiller ie paracetomol or ibuprofen but nothing is shifting it, what am I doing wrong and why are my readings going up instead of down.