Treat any life threatening injuries first. Keep the victim warm, do not give the anything to drink, and do not leave them alone. Call 911 immediately or send someone for help. The first responder is often called to assist in unconsciousness from a traumatic injury or concussion. The first remedy to use in this circumstance is Arnica.
Some specific remedies are list below with the conditions for which they are suited.
Alternating stupefaction and restlessness with mild delirium twitching, starts as in a fright, pulse frequent. Unconsciousness from traumatic injuries and concussions. Death rattle, great rattling mucus with no ability to expel it. Paralysis of the lungs. Convulsions and coma from a high fever.