I've been nervous on bike rides (training) so I can relate.
This morning I ran 2 1/2 miles. This past week I did 11 miles! My longest day was 5 miles and my shortest was just a quick mile when I had time. I reached a milestone (as it were) in my running; I can go 2 1/2 - 3 miles without walking! Once I reach that point, I go to the run 4 minutes walk 1 routine while I build endurance.
Have a great runThe weather is kind of nice for running even though it's cold.