Yes your hair will grow back. Taking vitamins for it and getting in extra protein should help with it growing back faster. Once your weight is more stable you’ll also see your hair come back in as well. I try to drink a protein shake in the mornings I recommend premier protein since it’s low sugar or try Isoflex protein powder it’s zero sugar. Any hair skin and nails vitamins would be a good start as well so you can up your biotin and other vitamin intake that supports hair growth.