It was not painful, just felt heavy. I thought it might be a
DVT. It was late
and I had no desire to go to the ER, so I took 2 aspirin and went to bed. The next morning, the swelling was gone, but I went to see my GP anyway. She sent me for an ultrasound, which showed nothing. A blood test showed that I had Factor V Leiden (heterozygous). I continued to take aspirin for two weeks and had no recurrence to date, despite several very long distance flights.