Hi there. Wow, what a smart lady to realize that your hormones are making things worse and want to try to keep them in check!
This is really hard. I find deep breaths really help me. Taking a little breather such as going for a little walk, sitting down in the restroom behind closed doors, going home later and journaling all of my frustrating feelings rather than speaking them all help.
Sleep helps any time our hormones are out of whack. Get a bit extra if you can. Eat healthy. Exercise. All of these things help keep us naturally stress free.
Here's an article on pregnancy hormones and moods that might be a good read:
http://www.medhelp.org/pregnancy-health/articles/Mood-Swings-During-Pregnancy-Your-Symptoms-Manual/2004
Anyway, I admire your wiliness to work on controlling this. Often those driving us crazy mean well or are important to the one we love and it is important not to damage that relationship with them as best we can. Be kind to yourself and hugs