@benzohar Wow.. this is like a post about my child LOL. Fortunately his tantrums are not quite that long but he's a frequent tantrumer. He feels deeply lol, about you know, his cheerios falling on the ground, or a lid not being able to be screwed back onto a bottle, or perhaps not having the red pajamas available, or god forbid, blocking him from trying to get to the oven... if we make it more than 15 minutes without one, we're doing amazing LOL.
Do you have any doting grandparents? My husband and I refer to it as "Grandparent energy", basically leave him with them for an hour, maybe two, and they can handle the screaming for an hour or two just to give you some respite. My child is still waking up 3-4 times a night, and twice a week he has bad nights of up every hour... I really feel you for lack of sleep. I get it. And yes, ours definitely was not a proponent for sleep training either. We co-slept, and then stopped because he literally lost his mind at bedtime and I was afraid he was going to hurt himself.
My guy tantrums a lot... and initially I found it very stressful. It started at 7.5 mo with little fits that were 5-8 min long... and just proceeded to escalate from there... re-direction doesn't always work, so sometimes I have to just move him somewhere safe and just let him be him... I've stopped stressing about it / don't care anymore, or let myself get worked up because I know just as quickly as it started, it can end just suddenly, and he can be quick to laugh and giggle. Definitely quick to temper, but quick to feel happy too. And I'm 100% sure it's linked to sleep. The days after a bad sleep he's really struggling.
It definitely sounds like you need a break and I truly suggest at least shifts with your partner for at least the days your partner is off work. You need time to have some peace and quiet. Literally even if it means your partner takes over, he screams and you just drive somewhere and sit or watch netflix on your phone or some shit, you need some respite.