From Alex, who knows from experience

As to rapid fire life changes, and how to deal:

have lots of patience with your mate
have lots of patience with yourself
exercise
have a drink when needed (those of us who can)
take turns watching the kiddo, and get out of the house, alone, if necessary
get some help: mom, dad, babysitter, friends--whoever. Date night once a month: Mandatory!
nap time is for more than getting the dishes/laundry/cleaning done--it's sex time, too (if you have the energy)
hire a cleaning person every once in a while (I wish we had done this--we didn't)

Last but not least--don't make any other big decisions at all--none for at least 18 months. By then you should have your job under control and your head screwed back on straight. Let everything ride until then.