Not knowing how long you knew your husband prior to marriage or how long he has been unhappy, I can only say a guy who could walk out on a woman with a 15th month old baby is not much of a man. If he is unwilling to try to work things out you are better rid of him while you child is still a baby.
If your husband has been supporting you as a stay at home mom, the court might order him to continue supporting you and your child until you can get a job. So I wouldn’t rush out to get a job unless it’s absolutely necessary. He may want to be free of you, but he can’t be free of his financial obligations. Go see an attorney now and ask for everything you want, he/she will advise you on what you are most likely to receive. Perhaps you could surprise him and serve him FIRST! Have all support payments sent through the DA's office.
I realize how unhappy you are at this time, but please do your best to take care of yourself. Pamper yourself and try and look your best, especially in front of him. I know you probably don’t feel like eating but it is important that you stay as healthy as possible. Pray, meditate (take a lot of deep breaths) and most of all focus on what is most important, your little girl.
Dry your tears because loving someone who doesn’t love you is a waste of your precious time and energy. I know that is easier said then done, but take baby steps.
Blessings…..