wife just fell backwards and hit her head and back on the asphalt road what initial concerns are there? concussion? she was dizzy getting up but walked into the house with assistance. back? hurts, doubts anything broke but it hurts, sitting in recliner very still hate to go to a hospital and sit in an impossible position for an hour waiting for help - or call an ambulance
With this much of information we can't judged accurately the extent of injury. This will depend on height of fall, rapidity and hardness of surface and age, sex and any underlying medical conditions. But roughly this can be said that if she has no persistent dizziness, sleepiness, nausea, vomiting, blurring of vision , headache then its only superficial injury. That will gradually improve with rest and if required painkillers. But you have to take care of these symptoms if any of these develops then this will be an emergency and imaging studies of brain that is MRI or CT scan is required to rule out any intracranial injury. Hope this will help.