Hurt foot 1 week ago. Had x-rays. No fractures, severe sprain. Can't bear weight. How long will pain/swelling last? How long on crutches? Healing time

Depends on the cause. Your pain could be as a result of many different things. A thorough history and physical exam and possibly some laboratory and radiology exams are needed to determine the exact cause. Causes of pain may include: trauma (fracture, sprain, arthritis), infection, metabolic conditions (gout), musculoskeletal or biomechanical abnormality and neurologic conditions (neuropathy).
Depends. On ligamental damage and bruising to resolve. 2-4 weeks. Faster with rest, elevation to reduce swelling, ice early, heat later.