I seriously doubt you have lost any "lean body mass" during your short fast! I fasted 60 days last summer and would not say I lost anything but fat during that time.
Any weight you lose will return with a vengeance if you do not start now to plan your post-fast diet and EXERCISE program! You can definitely do yourself a world of good in the weight loss realm by stepping up your exercise! Weight loss DOES boil down to burning more calories than you are taking in...