Re: Nursing and aunt flow
The periods you've had- how heavy were they? Normal, or more like spotting? Often moms who are taking hormonal contraception will have what's called "breakthrough" bleeding in the middle of the month. Breakthrough bleeding tends to be more towards the spotting end of the spectrum, so if you're having real period-like bleeding with heavy flow, then it's probably not breakthrough.
I think that when a mom says she's having menstrual irregularities, mood issues, and feels weak, she should go in and talk to her GP about her health in general and her thyroid in particular, since thyroid disorders (both hypo and hyper) are very common in the postpartum period and can cause all three of the symptoms you mentioned- in addition to many others.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"