Hi! it is really good to hear that even though you can't start a strict diet yet you did start eating in the morning and lunch that will defenitely stop you from having a binge at night when you're starving! they are really good things to do to start changing and you'll be surprised how much difference it makes i am sure of it.
About the skin i am worried about it too! it seems to vary from person to person i've heard people that have very little saggy skin left and i have heard people that have a lot. I am trying to put on coco butter on every day and see if it helps... if you're going to the gym then swimming and little bit of weights will probably help tone your arms and legs. i am sure i will have a lot of saggy skin in my tummy but i don't care as much about that i really worry about my arms most of all as i would love to be able to wear sleeve-less shirts without a wing on each side
but we'll see ... as i think about it if i have to worry about saggy skin in the future it will be because i have lost loooots of weight and will be happy about that...mabye if it is really bad i can consider surgery... but for now i am focused on loosing the weight as if i had to choose between saggy skin and being super morbidly obese with a BMI of 49!! i will choose the sag for sure 
Good luck and let me know how you're doing! you have already started changing your life now don't look back!!
About the skin i am worried about it too! it seems to vary from person to person i've heard people that have very little saggy skin left and i have heard people that have a lot. I am trying to put on coco butter on every day and see if it helps... if you're going to the gym then swimming and little bit of weights will probably help tone your arms and legs. i am sure i will have a lot of saggy skin in my tummy but i don't care as much about that i really worry about my arms most of all as i would love to be able to wear sleeve-less shirts without a wing on each side
Good luck and let me know how you're doing! you have already started changing your life now don't look back!!