The burning sensation is likely due to exposed nerve endings from the fall or skin irritation from the topical cream. I recommend stopping the antibiotic cream, as it can sometimes cause local allergic reactions. To soothe the area, apply a thin layer of sterile petroleum jelly; keeping the wound moist protects the nerves and aids healing. For oral pain relief to help you sleep, you can take paracetamol or ibuprofen to target pain and inflammation. Please consult a doctor before continuing the oral antibiotic, as it may be unnecessary and cause side effects. If you observe spreading redness, swelling, or pus, have a healthcare professional evaluate it.