CRAP! Need Oblivion Help?

So, for those who have never played Elder Scrolls: Oblivion let me give you the low down of the game. Basically you do whatever the heck you want. You want to play through hte main quest of the game (save the world) go for it! But if you just want to wander the countryside and pick flowers, you can do that too. Want to be a thief and steal people's forks? Hurray! Wanna be a guard and put the boots to fork stealing jerks! Do it.

The openess is fun but there are two major drawbacks. First is you can get kinda paralysed byt the sheep amount of stuff that you can do. You can spend hundreds of hours playing and not touch the main quest. And that is daunting for some. It's like eating an elephant: how do you even start? The second thing is that since it IS so open, you can um... potentially fuck up the game.

Case in point. I may have dungeon dived, taken and sold an item that I need for the main quest (great welkynd stone). crap. crapcrapcrapcrap. There are dozens of vendors that I could have sold it to. Now: I am not actually sure that I tool the artifact in question yet (I havne't actually been back to this dungeon in ages) but it is entirely possible that the aritfact is gone. now... for the PC version I think there is a cheat (you can type in a code and get inventory items: I can just "create" a great welkynd stone) but does anyone else know about any cheats?? Or what I can do if I have sold the stone?

on the homefront: Erica is sickish again... She has a rough voice and when she cries she sound like she could be croupy. No fun.

on the workfront: I am in talks to make a move! Still with goverment: lateral move (lateral moves are not as "career ending" as they seem to be in private sector) the good news is my potential new degisnation is more in line with my skills (from a biologist to a science generalist) and the position is WAY more transferable (compliance officers are needed all over the government). Wish me luck

EDIT: Sucess! Got the stone: I guess I never got far enough in that dungeon to find it. AND it's actually worth nothingg: probably as a prompt to not sell it.