Maternity leave ending

Today is my last day of maternity leave and I feel sick to my stomach and just want to cry and cry. I have always wanted to be a stay at home mom but we just cant afford it. Our daycare lady is grea, has taken care of my other son for 5 years but she is still not the mommy. My new baby son is a little colicky and I know there will be times when she has to let him cry and that makes me even sadder. I dont know how I am going to keep ahold of myself at work tomorrow!