You sound burnt out OP, I hope you’re ok. Do you have a DP or family/friends that help you out at all? Someone to take little one to the park for an hour or 2 every now and again? So you can get those much needed little breaks sometimes.
In terms of when it gets ‘easier’, I don’t know, I couldn’t give a set age to be honest. I think there’s all sorts of worries and difficulties that come with different ages/milestones. Mine are 5, 3 and 1 so all still very little but I find that there are different stages that they move through, each stage has its ups and downs, not really a set age that suddenly gets a lot easier.
If it’s the dependency on you that’s taking it’s toll then I’d say around 3/4 when they want to become more independent with dressing etc and you don’t have nappy changes to do then that side of it is a lot easier. Of course then as well they’re communication is so much better so the frustration/tantrums are far less, in my experience anyway.
I was speaking to a woman in the supermarket the other day who has 3 teenagers and she said to me she wishes her DC were still my DC’s ages as at least I know where they are, who they’re with, what they’re doing, I can protect them etc. She said the teenage years are hard for lots of reasons, which I can imagine.
I know what you mean though, that 1-2 age is very physically and mentally draining, they’re VERY active and into EVERYTHING aren’t they!