Lost Master Bedroom Key While Entering, Now Stuck

Okay, so I'm doing Memory Paranoia, right?
It's a pretty big quest, and it's taking me some time to find the master bedroom.
After a while of trying to figure it out, I teleport over to the mansion pre-decay and make it to the Master Bedroom Door NPC.
I use my key on it.
It glitches out.
My Master Bedroom Key is deleted.
And now I can't get through the door.
And I can't find a way back to the ruined mansion.

So what am I supposed to do?

 

/fixquest?
Does that work?

 

The master bedroom key is an untradable item, does /fixquests work on those?

 

Probably not (sorry for late reply).

 

Well, I did Aldorei's Secret Part I today, and lost the boots required for the final stage.
I think it wasn't a quest or an untradeable item at all, but I lost it somewhere because my game crashed.
I did /fixquests and got it back.

You're probably going to get it back, considering that the boots that I got were neither untradeable or a quest item.