I ran 5 miles a day for the last 10 days. Last night I bicycled 8 miles to the grocery store. There I walked around for a half an hour in boots that had bad cushioning. This morning when I got out of bed the front and side of my hip hurt fairly bad. Now it's ok. I can walk without pain but I'm afraid to run. Does anyone know what this is? Is it common? How long should I wait before I run again?