Re: Breast feeding, exhaustion and anxiety.
You need to make sure to eat enough. Also make sure to get outside daily and get a little exercise (even if it's just a short walk with the baby).
My son nursed every 2 hours around the clock throughout his entire infancy (sometimes as frequent as every 1 hour, occasionally he would give me a 3 hour stretch at night), but he got pretty efficient and often got what he needed in just a few minutes. I needed to nap when he napped, go to bed earlier, and cosleep to get the sleep I needed. It is exhausting for awhile, but your body acclimates to broken sleep rather than continuous sleep.
However, the anxiety is potentially problematic. You've suffered anxiety prior to the baby, correct? You should go talk to a psycologisy/therapist/counselor or the like. It is possible that the anxiety is causing the exhaustion rather than the other way around, particularly if you suffer from chronic anxiety. You really should consult a professional to find out if you would benefit from a medication or not. Many medications are BF compatible.
K. Sophia - Mama to my little lactivore, the amazing Mr. X (11/10).