How many quests are there before you get to Krokopatra in the tomb of storms? I know Krokhotep has a few. Do you have to do all of the side quests though other than Krokhotep? Also in the krokosphinx, one of last quests were to get dust to light the braziers that unlock that boss in the entrance hall. Is that a necessary quest other than getting XP, etc.?
Just do the quests in book, if it is too hard, get back to it later. See if you can progress without doing the side quests. I did most of the quests but not Tomb of the Beguliar, to progress.