Signing the divorce papers tomorrow.... I will officially be a single mom of an infant

My husband asked for a divorce when I was 3 months pregnant. I'm not going to get into why because there's a lot there. It was just really hard. He moved out. Well I went into preterm labor at 8 months pregnant and our daughter had to stay in the NICU. So we didn't even talk about a divorce. We thought she wouldn't make it but we were each other's shoulders to cry on. When we could finally take her home he spent the night for a month. She is so strong now and my husband moved back out. After all we have been through together and being there for each other I talked to him and asked about the divorce and if maybe we could make the marriage work. Even with counseling. He said he would think about it. Then he told me in person he thought about it and he is sorry but he can't. There's just too much hurt there and he doesn't see himself being able to gain full trust ever again. He did file for divorce. Well... Tomorrow is the day. Worst part is my birthday is the Wednesday... I'll be spending my birthday as a single mother. We have already went to custody court for joint custody. I don't know what else to do.... I'm broken.... I obviously can't be a sahm because I'm a single mom now so I found a day job. My son to be ex husband works night so he will have our daughter during the day... Will this get any easier?