One of the Oracle's curses is Lich; someone with this curse is almost but not quite a Lich. The only way I know of creating a Lich is by constructing the 120,000 gp phylactery; since this oracle has met most conditions, do they get a discount?
The Oracle's Lich curse description says:
Every living spellcaster hides a secret in their flesh—a unique, personalized set of conditions that, when all are fulfilled in the correct order, can trigger the transformation into a lich. Normally, one must expend years and tens of thousands of gold pieces to research this deeply personalized method of attaining immortality. Yet, in a rare few cases, chance and ill fortune can conspire against an unsuspecting spellcaster.
You have (unknowingly) fulfilled most (but not all) of the ritualistic components to achieve lichdom. You have yet to turn into an undead creature, but you are close. You take damage from positive energy and heal from negative energy as if you were undead.