hi julie, welcome
im afraid you already know the answers you seek
if you want to control your diabetes and your weight, you will also have to control your diet, if you are ready to do that there are many folks doing that here, happy to share there methods but eating the sweets in the evening will not work for you, so you have to choose the right path to follow, it isnt easy but you have it within yourself to make the changes, only you can do it
best of luck
andy