I've done exactly the same Fannyanna, I was on this board last year trying a low GI diet but it just didnt work and I didnt lose a thing! I joined SW last week and am loving the plan so far... I have done it before years ago and it did work so hoping it will this time round too - time will tell!
Also started officially taking my metformin too - was supposed to do it about 4 months ago but kept putting it off/forgetting so I'm on a mission to turn my life around now!!