The constipation issue is pretty much resolved. What was missing was oats and high intensity activity.
As for the fatigue and anemia: feeling better. Enough to run and do more intense workouts again. However, I am holding myself to a promise of "No 26.2" this coming year. I think 5K, 10K, and sprint duathlon (5K run/20K bike/5K run) should keep me busy.