Although there is a very prevelent strain of diabetes in the family, for the last 2 years I have been borderline when taking a oral glucose tolerance test. I am drinking more and urinating within 20-30 mins of drinking even a small cup of liquid. I am also tired, 50 year old woman, hypertensive (controlled with medication and simavastatin). My knees seem weak, and it appears they give way at times when I stand up after sitting for about 1/2hr, I also feel very stiff from the pelvic area down to my knees.