Tori - I assume you've been cleared by your doc to exercise? If not, get his/her OK first. You certainly don't want to aggravate it and cause more pain or a longer recovery time. If you're not OK'd to exercise, put the laser focus on your diet while you wait. They say great abs are made in the kitchen anyway.
I second (or third) the notion of planks, even if you have to start out on your knees and elbows and only hold for a few seconds. Keep in mind that your "abs" shouldn't be your only focus......your entire core (front and back, shoulders to rear end) should be strong to help prevent back problems and other injuries. Try some pulldowns, romanian deadlifts, and bent over rows. These will work your lats, back and core in general. Throw in some balance exercises and you'll be well on your way.