welcome to the forum - for me I can tell I am getting a cold well before I see any cold type symptoms simply by getting unexplained increase in BG's - I think you will find that most people see elevated levels when dealing with bugs/colds etc - as frustrating as it is whilst you are trying to improve your levels, you just have to ride it out - not a lot you can do ! - I have only been diagnosed since August last year - I have had three minor colds since then - all of which gave me levels , and then quickly settled down again afterwards.