Up till this month I have had stable "feet on floor" blood glucose (BG) levels in the morning. I then drink black coffee, have a shower and roughly 2hrs later test again. My BG at this test has been usually 1 or 2 mMol higher but consistent at this level so OK thats how it's working, live with it. Over the last month same routine but BG post coffee and shower now varies widely anything from -2 to +4. Any ideas of the cause and possible methods of stabilisation would be appreciated. Current treatment is Metformin and diet.