Boob Shrinkage

I’ve literally lost all my boobs😑😂 I went from a size D now to an A cup like wth! I lost 30ibs and lost my boobs. Has anyone experience this??? If I gain weight back will my boobs grow? I’m feeling like a man ladies 🤦🏻‍♀️🤦🏻‍♀️🤦🏻‍♀️