You are well on your way to making things work by focusing on your faith and the responsibilty you have in raising your grandchildren. Your fear is that your health might suffer and that you might not be able to raise the children. Yet who's to say that even if your weight was ideal, you wouldn't be facing some other challenge (even a challenge with your health)? The anxiety you feel about not being there for your grandchildren could possibly be more detrimental to your health! Your worries are reasonable and understandable. My prayer for you is that you make strides in handing over the source(s) of your worry to God so that you can focus clearly on your family and on maintaining your own good health. Be at peace. God bless you and your family.