Ever since I went into the Cursed Abby my stamina continually drains. Even if I am standing still it drains. If I use a potion to refill it, it just drains again. I am not over my weight limit and can't figure this out.
You picked up a cursed weapon! Look in you inventory, and you will find one of the weapon's description saying "something seems to be wrong with this weapon". Simply drop it, and your stamina will not drain anymore.
In times of crisis it is of the utmost importance not to lose your head (Marie Antoinette)