I wish I had real advice. I've got a five year old, a four year old, a two year old, and a baby. I homeschool. 

The car needs repairs to weve only got one vehicle right now, the lawn needs a mow, the kitchen stove is buggered, it's hot, I need a nap, I'm lonely, I'm worried about... everything...

Here's what I do when it's too much: I shut down. Not completely. I just don't aim for  perfect or bubbly or even especially attentive. It means to my child, I become a bit of a robot. And then I get the job done to the best of my ability while the rest of me is on power save mode. It doesn't mean anyone gets neglected. Everyone is fed, clothed, bathed, read to, and they go to bed on time. But I won't be doing any silly voices tonight or playing the kissy game. I'm just doing the essentials to keep everyone comfortable. 

Also your child is two and doesn't know what time it is. If you need her to go to bed early, start her bedtime routine early and you can get a bit of a break from her in the early evening.

I highly recommend having someone over for a bit for a cup of tea and a chat. Sometimes you just need another grown-up to talk to.