Also, a free and much more likely to work method is to hit L and go to a PvP campaign, where you'll appear pretty close to the wayshrine so you can simply return to wherever you were. I have had /stuck not work during repeated attempts (for instance if you get knocked back into some weirdly shaped concavity where you're eternally "falling") but porting to Cyrodiil always seems to work.
I remember being in a dungeon and used dragon leap or whatever it's called and got stuck in the ceiling waaaaaaay up high. No idea why it did that, but it was hilarious. Nor does it answer your query in any way.
in case you have some friends or guildies, you can just click on their name in the "O" or "G" list and teleport to player, it is free.
if not, you can make a support ticket and ask for moving of the character elsewhere