I was diagnosed around 7 months ago and put on insulin. I have had controlled bg levels all the way throughout with very little insulin as I am very sensitive to insulin and would go hypo with very little, even for a week I didn't need any insulin at all. Now all of a sudden for the past 4 days my levels have been going into the 20s, 19s, 18s and insulin will not bring it down. Tonight I tried taking 11 units of humalog with dinner and 2 hours later I'm still in the 18s. Could anyone give me any advice? I have made sure my insulin pen is fresh and in date and correct temperature. I have been rotating injection sights but still not working.