If my suspicions are correct I'd probably have to drown myself in a river.

 

 

 

I've completed all of the doors, and I'm currently on the last one where you have to reflect the four different-colored beams into the one, single pillar. I forgot to rotate the red beam back to the cyan door so I can access it later from the staircase, so do I need to do everything all over again now? I teleported out, in case you're wondering. Please don't tell me I'm stupid...I know I am. I had 7 life and had run out of food, which is why I teleported out. Your answers are appreciated.

Hopefully you talked to the dwarf before you teleported out. If you did, then he probably told you about other dwarves making a tunnel through from the underground pass area. It's not exactly a quick shortcut, but it is probably quicker than resetting the final light beam. Look for an entrance in the cavern wall on the south side of the dwarves' buildings in the Underground Pass - where you met Klank, etc.

Bit confused as to where you are.

 

 

 

If you have done it all then the "back" door will be open which is accessible from the death altar (use Abyss of death teletab) although I am unsure if this is accessible before completing the quest, it should be as you already have access to the Elven lands.

 

 

 

If you have neither door open then your kinda screwed.

 

 

 

EDIT: Next time just wear prayer gear and pro melee. They won't hit you at all.