well,most hiatal hernias do not need
surgery,and there are simple things to do to help if it bugs you,,,try elevating the head of your bed several inches,this keeps the stomach pushing downward,,and not from pushing up into the hernia.
when it gives you pain,,try drinking a big glass of water,this often helps also.
as far as a sliding hernia,ive NEVER heard of this before.,,though i am not a doc,,me and my father both have one,and i kinda know more then most on this subject.