How long have you been Type 1 (that is, are you still in the honeymoon period)? Have you looked at what all the medications you are taking do to either blood sugar or weight? I'm not familiar with all the side effects of all of these drugs--they may effect your body in ways that make it harder to lose weight.
Am I right in assuming you are taking the metformin to combat insulin resistance? My understanding is that metformin may be helpful in losing weight.
That stuff about changing rapid-acting insulin is the strangest thing I've heard in a while. Your insulin may, over time, become less effective. But it should take quite a while and I haven't heard of it happening THAT often.
As far as losing weight, I would suggest you go to a dietitian and figure out your caloric needs. Ask him/her to suggest a carb count to lose weight and about diet plans. When I say diet plans, I mean what you eat, not a special way to eat that you stop doing once you've lost the weight you want. Those are nonsense. Diet plans are ways you eat to live.
If nothing else, talk to the dietitian about what you DO eat to see if there are ways to replace foods that are not as good with something better.
Exercise is all about developing up a habit. Try to find a time to exercise that you can do every day (or at least five days a week). Don't worry about making your exercise intense at first. You are not going to lose all your weight in a week. Make sure and steady progress toward building up a habit and you will soon find that exercising is just part of your daily routine. Let me/us know about your progress.