HI Christina,
Your story sounds exactly like mine! Mirror images.
Well first off, one of my friends gave me a valuable piece of advice that worked wonders... make sure that EVERY day you get out of the house with your daughter, whether you:
** go out for a walk with your daughter in a stroller
** hang out at the local park and meet other moms
** browse a store
** visit a friend / neighbor
** get some coffee at a drive through
No matter what, get out of the house. I was feeling the same as you... when my husband got home from work to take over & give me a break, I was too drained and wiped out. But once I started getting out everyday, I felt so much better. I was also scared about driving around with my daughter, but I forced myself to get out there. Once you are out a couple of times, the anxiety should dissipate. But if you can't bear to get into the car with her, make sure to bundle her up and, at least, get out for a walk.
Another aspect that helped immensely was exercising everyday when she naps. Any type of movement will help keep your mind bright and your body alert. You could use DVD's, follow a fitness program on TV, create your own weights & cardio routine (using milk jugs and stairs), or follow an online program with a message board (I use Biggest Loser Club and communicate with all the Moms).
Next, we are so used to, in our professional lives, being on the go, go, go... always goal oriented... always hitting deadlines... and always trying to beat the clock. Now that you have your daughter and you are at home, all of the daily grind has shifted to more mundane and repetitive tasks that don't change up (diaper changes, feeding, cleaning, etc). Adjusting from the professional world to the stay-at-home mom world is tough... your mind has to make a 180 and shift gears. Rewards aren't the same as they were in the professional world, so recognizing the rewards of raising your daughter right now is essential. Part of the boredom, for me, was shifting from the industrious nature of the work world to the nurturing world of the home world.
Lastly, I take pictures of my daughter every day. During her naps, I download from the camera and onto the computer. Then once a week, I order prints from shutterfly.com, selecting some of the best shots. Then when they arrive, I organize into her album. This keeps me busy with memory collecting :)
At any rate, I know how you feel... and I think a great deal of stay-at-home moms feel exactly the same. Pretty soon your daughter will be moving around, which adds new excitement, as well she will become more interactive and playful. Then, the next thing you know she will be walking and getting into EVERYTHING... so enjoy the peace and absorb all the cuteness of babyhood because before you know it, she's a wobbly toddler :)
Best of luck,
D.
ps: let me know how you are doing :)