Anyone else worried for the arrival of their new baby?

So, time is coming quickly, I have 4 weeks left until my little girl arrives.

Although excited, I'm beyond worried too.

I have a 3 year boy now, he's a handful and super intelligent & independent which causes us to already bump heads lol.

He will be in preschool 3 hours every morning of the week.

I will be a SAHM, but also helping with events with our families Winery.

My husband works anywhere from 13-16 hours a day, due to the demand in his job and being the only one who does it, he's not home, in what feels like ever.

I mentally am exhausted already.

I feel like I'm failing at keeping everything together all the time.

Being as pregnant as I am, I feel like I can't even keep up with my toddler or like I'm failing him because I have no energy to get out and do much. If we do, it's always a struggle lately.

Will this get easier?

Any ideas on anything to help?

I don't want to hit a wall and become unmotivated and depressed. My last pregnancy I felt rough after and I was put on Zoloft, which I hated and immediately stopped taking.

I just feel overwhelmed right now & need a way to breathe.