Blood sugar will not go down type 2 diabetes?

hi, my father has type 2 diabetes. For the last month, hes been battling it very badly. hes goten up as far as 450, and one day at 180. in an entire month. He was care flighted about 4 years ago because his blood sugar hit about 500. we are very scared becasue hes on insulin, daily. and they are upping his insulin by 1mg every day, and his blood sugar still wont go down. He was at 260, then ate a few blackberries and it shot up to 350. we know his pancreas is having troubles and that his kidneys are not breaking down the sugars. but the insulin is not helping either. he is eating very well, not eating past certain times of the day, he lost 80 lbs going from 340 to 260. and he is still losing weight pretty slowly but healthily. hes 49 years old. he told me he was going to try diet pills, but i dont think he should given he is diabetic. please help..is there anything he can do, anythign at all, to help bring hte sugar down? he can barely even touch any food right now because it sends his sugars up..even bread shoots it up