Do you drink caffiene at all? Most of the time Caffiene will help, it's in all the Migraine medications available over the counter.
It could be that I drink a cold pop too but I'm sure the caffiene helps.
Half a cup, or glass so you don't turn the baby into a Cirque D'Soleil performer.
The next thing I would suggest is changing the pillows you sleep on. AND sleep every time you get your 4 year old to sleep. Forget the chores that you can only do when little one is down for a nap, you need to extra rest for the baby much more than an ultra clean house.
good luck to you from one military wife (retired) to another.