From my personal experience and watching my fiance...I think lack of sleep has a lot to do with certain anxieties. My fiance has a sleeping disorder, and while I was pregnant his sleeping disorder got worse and he started being suspicious and acusatory of me (for NO reason). He got his sleeping problems in line and since then, he hasnt had any of the same thoughts (and if he has they are minimal). After our daughter was born, lack of sleep for me kicked in and I became very emotional and anxious. After getting more sleep daily, my anxieties lessened and I returned to normal (for the most part). However I am having different anxieties now, and I believe it is due to too many thins going on in life (fiance returning from deployment and everything that entails, moving back to where we were, leaving my family, my daughters 1st birthday, on top of numerous other things). So, anxiety has many causes...and I believe your hormones can contribute, but I also think that lack of sleep and everyday stressors are a big contributor as well.
Yes sounds like hormone related issues you had after the birth of your daughter,not uncommon at all.Lily