worried about my medicine

i take a medicine called depakote for epilepsy and i just found out friday that it is delayed release and i cant take it. my surgery date is thursday! apparently there is a liquid form of the medicine which i am hoping to switch to. i called the dr today about it but never heard back from them and they didnt call it in to the pharmacy. so i have to call again tomorrow and try and get this taken care of. so scared i might not be able to get the surgery on thursday! i have waited so long. why didnt someone tell me before during all of this that it was delayed release!!! beth