My left foot is swollen - only the left - this started yesterday morning. Was much better this morning and is now swelling again. Also, had some pretty intense pain in my lower back radiating into my hip yesterday. That was also better this morning, but is now returning. This happened about a month ago, and then just went away. I have osteoarthritis and often have pain in various joints -- usually knees, ankles, hips -- so I dismiss most aches and pains to the arthritis. But this pain in association with the swollen foot seems different. Any ideas??