For temporary relief from both a headache and backache, you can try over-the-counter generic pain relievers like acetaminophen or ibuprofen. Acetaminophen is effective for general pain relief, while ibuprofen is an anti-inflammatory that can help ease muscle tension in your back. Please take them according to the package instructions and avoid combining them unless advised by a doctor. Additionally, try to rest, stay hydrated, and apply a warm compress to your back. If your pain is severe, does not improve after a few days, or is accompanied by other symptoms like a high fever, please consult a healthcare professional for a proper evaluation.