Anybody else experiencing this?

I am 18 days post-op. In the last week I have been experiencing something strange. I am usually cold most of the time and my feet are cold in the morning hours. The last few days it feels like I have some very warm liquid running over my right foot. It happens once a day and might last for 3 or 4 minutes; then it goes away. It feels pleasant to my cold foot while it lasts, but it is very strange. Any ideas?

I would wonder if it was a result of nerves that were irritated during the operation. I had some odd feelings traveling down my legs, but they have all but disappeared at 5 wks post-op