During the summer / autumn I was taking 11 - 13 Novo Rapid before breakfast and then having my usual egg on crumpet which is about 20 carbs , going for my 2 mile walk and if my blood sugar was around 8 it would more often than not drop to 6 or less , just recently however it has gone the other way and after coming back from my walk it can be anything like 14 - 17 and I am having to take a serious correction dose to get it down before lunch , I can only put it down to the cold weather as I cannot think of any other reason why this is happening , I did find during the summer if I gave myself more insulin my blood sugar would rise hence I lowered my dose to 9 and my bs would go into hypo it can be very frustrating you would think giving more would lower it but it sometimes for me anyway it does seem to raise it .