How on earth did you manage to activate the quests mq15, 16, 17, 18 and 19? Normally the Temple of the Soul Flayer should be locked, and so is the Dusk Tower... Did you unlock any of those doors?
Anyway, I'm sorry but the best I have to offer is my last character before his way to Waverock. So you will have to do the journey once again. Also, it's from the German version, so some scripts might get reset when you open it with the English Nehrim, but I hope nothing important does. It will be better than going on with your save which is broken in many ways.