Suggest Treatment For Diabetes

I am a diabetic patient since last 12 years. I am on 30/70 human insulin and used to take 8 units every before lunch since last one and half years as prescribed by Enchronologist at Narayana Hrudhalaya, Bangalore. By the way, I am 67 years old. Before that, I used to take 3 mg Glimpiride tablet. On 08.12.2010, I put on my shoes and walked for about one and half mile. While walking I did not feel any pain in my feet. But after coming home and openining my shoes,I started feeling severe pain on the big toe of my left foot. Next day, I got my blood sugar tested and found the blood sugar Fasting 124 and PP 239. I immdiately consulted my physician and he diagnose the foot infection as pyronachia and prescribed some antiboitic tablet. Healso incresed the does of insulin taking 15 units before breakfast and 8 unit before dinner and advised me to test the blood glucose after 1 week. When I got my blood glucose tested, the fasting went upto 200 and pp 305. The doctor advised me get the infection surgically treated. So I got the ulcer operated and half of my big toe nail was cut. The surgeon prescribed me to take Percin antiboitic tabelts.After 1 week, I got my blood sugar tested and Fasting came down to 143 and PP 257. I took about 20 percin tablets but the ulcer has not yet been healed. My physician advised me to continue the percin tablets. But when I went to the surgeon for dressing, he suggested me to discontinue taking percin tablet. As the wound has not been completely cured, I consulted another Enchronlogist,who has suggested to check my pp blood sugar.Accordingly I got pp blood sugar tested and it has come down to 158. But the would has not been completely healed and I have to get it dressed every 3 days. I would like to be advised what action is now to be taken and since the ulcer is not curing,is there any possiblity of its turning to Gangrene?