Re: advice: back to work, leaving newborn with babysitter..
Bhenjee, all new moms who have to return to work go thru this heartbreak. Its a completely different issue than who is caring for your child - the thing that makes you upset is that its not you...right? Some moms fare better than others but eventually things will settle for you. Your baby will always know who her mom is and always be delighted when you get home.
Have you considered any work-at-home positions? You could look into being a care-giver yourself. Or some sort of data-entry position. Depending on the type of work you're looking for, many companies now allow their employees to work from home at least some of the time so you may want to ask about that also.
I wish you the best!