K.D.
My advise is to BREATHE, RELAX, you are doing the best that you can - give yourself some credit! It's not easy when the kids are extra whiny and clingy! See if you can give yourself a break to have some downtime. (I've been a mom for 7 years now, and I am just now learning how important it is to take time for myself! It's not easy to find the time, but it is necessary!) I know I spend too much time worrying if what I do is right, or enough - it's so hard sometimes with all the different advise from books, magazines, etc to know if you're doing the right things. Love her, snuggle her, and remember - this too shall pass!
Good luck!