I don't see how a pregnant woman's patience level decreasing along with the increasing girth and physical drain is considered abnormal. I see it as VERY normal... you aren't feeling the same, looking the same, are unable to sit, stand, lie down, pee/poop, or dress the same. OF COURSE you will be a lot more moody!! My husband either leaves me alone when I need help, or is the other extreme - won't stop touching me when I want to be left alone!! My 5 y/o - I love her so damn much - but her constant talking, building things in the living room, leaving a mess, etc is driving me nuts!! This is NORMAL... we are both towards the end of our pregnancies and want our bodies back (I'm 35 weeks)!
Don't create a mental disorder for yourself because you are exhibiting normal behavior!! It will pass - most likely once you, newborn and family get into your new groove.
***ADDED after 2 flowers***
There is the abnormal depression as well as the NORMAL moodiness of late term pregnancy.
If women weren't expected to keep the same schedule and 'chores' such as working, being the main child caregiver of the family, the main cook/cleaner/laundress/etc... maybe the stress load would be more manageable and us pregnant ladies could be all smiles, giggles and glowers - but that is not the reality. Reality is - we are still expected to do everything on top of carrying a load of 50% more blood volume, having squished intestines, squished diaphragm & lungs, bladder that is ever full, horrible joint pain and charlie horses... of course we aren't going to be happy campers 24/7 - no matter how much this pregnancy is wanted. PERIOD