I was in much the same position as you a little over four years ago. I was taking three different drugs and despite rotating through different combinations it just wasn't keeping my blood sugar controlled. Only in my case the doctors were "insulin resistant," refusing to let me start insulin. Eventually I made the decision myself.
Like you I had a chronically high fasting blood sugar and the insulin really helped. I also found that becoming smart about insulin really helped me understand everything. Eventually it will be important to become self-reliant. The books "Using Insulin" by Walsh and "Think Like a Pancreas" by Scheiner really helped.