Take the metformin. It will help you a lot. How long were you on it before? Did you give it a chance for the side effects to go away? It also helps to curb your appetite. I take metformin and I don't even have diabetes. I take it because I have poly-cystic ovarian syndrome (PCOS), which causes me to have insulin resistance, which can lead to diabetes if not properly treated (medication and better diet). I am finding when I stop metformin, I have huge cravings for junk food. Now that I am on it, I've lost 10 pounds (I am 275 lb). Have you talked to your doctor about the possibility of having PCOS? It could have attributed to your weight. Congrats on losing 40 pounds though, that is awesome. I'd like to lose more, but I now have foot problems which limits my ability to walk long distances.