When I get upset (especially with my hubby) the thing that can almost always calm me down is washing the dishes. This is STRANGE to me since dish washing is my absolute least favorite chore. But since I hate to do it and put it off at all costs, that means there are usually plenty of dishes for me to wash whenever I do get upset. So I get a clean sink and time to think & diffuse which saves a fight (which is good since my frustration is almost always due to my own over reaction).
At least all these crazy pregnancy hormones are having one positive effect - I've been getting my dishes washed a little more frequently.