gestational diabetes - guide please......

[sonumickey]

hi everyone -
this is my 29th week of pregnancy, and i went for this gulcose screening test. but when the results came they told me, i may have a gestational diabetes and have asked me to go for a 4 hour gulcose screening test. i am really worried about this.
will this affect my baby in anyway or will there be any problems during my delivery time.
will gestational diabetes go away as soon as the delivery is over. i am very confussed as well as scared.

please help ...

thanxs in advance
gayathri