welcome aboard! about the hair. it's usually the result of the hormone changes associated wtih the rapid weight loss. and IT GROWS BACK. i promise. it's temporary. and it's not like you lose ALL your hair - it just becomes thinner - and yes, a few people do get some bald spots occasionally, but again, it grows back.
hope this helps!
why have you decided to look into surgery? it's a huge decision - and there's a lot that goes into making it.