All the above advice is also correct. Work with your doctor, tell him you have a goal to try and control, with diet, Metformin, Melatonin, and blood testing. Dr shouldn't care too much as long as you keep seeing him.
Ask to try Metformin on top of your insulin, and get cheep blood strips. I use GenUltimate which is a clone of Onetouch. and is used with their meters.
TrueMetrix is another cheep one, and walmart has cheep ones under their relion brand. Trick with walmart is there are many types of strips under Relion and each uses a different meter. In my opinion, better to by cheaper ones cash, than to pay co pays, for possibly less total tests.
Melatonin is FDA approved to treat jet lag, which is caused by the trace radiation that planes pick up being up in thin air for so long, and the insulin effects were discovered later, as it is a metabolite of Serotonin. Also noteworthy it basically doesn't have a lethal dose, they can only kill lab animals with a saturated solution in their blood using a dialysis machine. If you drink you might be low in b vitamins, and melatonin often but not always has b-6 to boost absorption and it can cause night mares in drinkers. so just a fyi, to start with a multi vitamin, b4 starting melatonin.
Get a book with info about diet, simple carbs, complex carbs, and increasing your consumption of unsaturated fats. Olive oil, and plant fats.
Good luck, I hope you see this and get to just pills, good nutrition and checking your blood sugar from time to time and keeping up with your doctor.