OP- you need a break. My DD2 gets hysterical when I leave her but she’s fine once she realises I’m gone & she’s with family she love. I went on honeymoon this summer without my kids (who are 4 & 22 months) for 5 whole days! DD2 cried & cried but then didn’t cry again the entire time!
In the kindest way, you are being VERY defeatist. Every suggestion, you are batting back that it won’t work. Well, it won’t if you don’t try. Find a way to get calpol down your kid. Spoon/syringe/pinning him down and forcing it in (they’d do this in hospital if he needed it).. you aren’t being cruel, it’s for his own good. Small amounts, 1ml at a time.
Take a break. Arrange childcare for a day at the weekend & go have a lovely day with your husband. Make this a regular thing, once a month or something. As a PP said, book a days annual leave together when he’s at nursery! Carve out some time.
This evening crying will pass. With my first, I catastrophised everything. Every phase I thought would last forever. But they don’t. With DD2, I don’t stress. Yes, it’s not easy to loose your evenings for a while but they’ll come back. DD2 is the same age as yours and actually doing something similar at the mo. We take it in turns & so long as one of us gets a break to watch TV, that’s fine. It’s not together but it will be in a few days/weeks!
This will pass OP. And in the midst of your anger & annoyance, remember he’s your little boy. He’s still so small & desperate for mummy or daddy to give him comfort. You are his whole world. The people who bring him the most comfort, the place where he feels safe & loved. That’s all he wants. And it’s hard, it’s relentless, I’ve been cross & angry myself plenty of times but ultimately, this is what it boils down too. He’s not purposefully trying to annoy you.
I hope you are OK. It’ll pass.