Anyone that's had a pulled hamstring?

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I have lost most of my weight running. I love it. Not sure when or how but I am pretty certain I pulled my hamstring. I am within 5 pounds of my goal and was super excited that I might reach it before I go on vacation in a few weeks. Now all I can do is walk and I am not really sure that I should be walking much. I walked a little under 2 miles today and it took me 33 minutes. :(

Anyway, I guess I was looking for some encouragement and support. This feels like a set back, and one I was totally not expecting.