I went into the cursed abby. About half way through my stamina started to drop to zero. Now it stays at zero. If I drink a stamina potion it goes up but quickly drops to zero again. I cleaned out the abby and finished the quest but my stamina is still zero. I am not encumbered. Is this a bug or was I cursed somehow and don't know it. Please help.
Well, it is a cursed abbey... There is a Halberd of the Rock you can find there (with a description like 'there is something strange about this weapon'), which will drain your stamina. Check your weapon inventory, and drop or sell it.