disables auto regenarating health and adds new items you need to heal
List of items:
Adrenaline: temporarily adds more health with a speed boost
Pills: slightly heals the player, has 3 uses
Medkit: fully heals player
Painkiller: last resort item, has a chance to either heal very little or add bad side effects
empty pill bottle: used to craft pills
pill starter: used to craft medicine items