 [ Symptoms ] what do i do if my blood sugar is 558 and i have congestive heart failure and never noticed sugar problems before  my friend checked my sugar and it was 550 and 10 mins later it was 558 and i have been very thristy and sleepy i have not noticed a problem with my bllod sugar before i have had this problem with my levels being no less than 427 as my blood sugar and today is the third day since i have been checking it please respond back asap [ Disease ] hi then it could just be a skipped period or stress but as i cant see you you could be overweight or even underweight have you been doing strenuous exercise these are the most likely ones off the top of my head but if your really worried go see your doctor does this help good luck