Question from Pennsylvania, USA:

I am 19 year old female and last summer I was diagnosed with hypoglycemia after a glucose tolerance test. Prior to the test, my doctor recommended that I check my blood sugar at home, and I repeatedly had readings in the 50s and 60s mg/dl [2.7 and 3.3 mmol/L], and even as low as 43 mg/dl [2.4 mmol/L]. It seldom went above 90 mg/dl [5 mmol/L], even after meals. I am also a swimmer, and my competition suffered significantly this summer. I went to a dietitian who recommended a balanced diet with fat, carbs, and protein. After a couple of weeks, I began to feel grow extremely thirsty, and, after tough workouts, I get sharp pains in my stomach. I have been urinating a lot, and drinking constantly. I have checked my blood sugar, and, after not eating for almost eight hours, it was 166 mg/dl [9.2 mmol/L]. The next morning, after a 18 hour fast, it was 134 mg/dl [7.4 mmol/L]. It has been between 110-135 mg/dl [6.1-7.5 mmol/L] over a dozen times in the last few weeks.

Some of my relatives have type�2 diabetes, but no one in my immediate family has it. What could this be, and is this normal? Should I ask my doctor about this? It does not seem to be getting better.