Struggling with Type 1 Diabetes: Seeking Advice

I've been type one since I was 10 years old so almost 20 years now. I have always had great control over my diabetes, ate well and exercised often. Over the last 12 months or so I've had so many problems. I've seen several specialists and 75% of the time have been told to lose weight. I'm curious if anyone else is or has experienced any of these symptoms because my doctors either don't know or don't seem to believe me. I've gained over 45 pounds in the last month (not due to unhealthy eating or over eating), constant high blood sugar especially in the mornings when I wake up, horrible fatigue, swelling all over, I'm always super thirsty, I have muscle weakness, joint and body aches all over and constantly, lots of nausea and gastrointestinal issues, and I've become irritatable. My blood sugar is high so often and for no reason whatsoever. My endocrinologist has increased my pump settings so much over the last year that I use almost double the insulin I used to and for the last 7 or 8 months I've been having to take metformin. I've religiously followed a diet plan and exercised alot and only continued to gain weight. I'm at my wits end. Does anyone have any advice?