Manzanilla (also known as chamomile) has a long history as a herbal cure in Hispanic cultures. Among other applications, it is utilized to treat depression and to sedate.
Arnica is a herb said to reduce inflammation, decrease pain and improve wound healing.
The golondrina bush (also called euphorbia) is a plant often used medicinally to ease breathing.
Probably as good a herbal remedy as any for someone recovering from a gunshot wound.