Obsessive Madness doesn't stack, it only checks to see if either the target or user has Obsessive Madness towards the other. Some of the healing skills in the game may not be passing the healer along, I fixed a few instances mentioned above.
HP Regeneration effects are always treated as coming from the regenerating unit, so that won't be affected by this, even if it comes from a different unit.
HP Regeneration effects are always treated as coming from the regenerating unit, so that won't be affected by this, even if it comes from a different unit.