Handhold OP, I have been there, absolutely exhausting, do whatever you need to, to get through it, and you will.
My DS2 was exactly how you have described your son, so I can empathise completely.
We were lucky my late MIL was an absolute angel, and looked after DS2 all night, one night a week for us, made us go out for dinner to have time as a couple, I used to feel guilty and say but he’s screaming, MIL said DS2 will scream whether you are here or not Rose, get away from it for a while. MIL saved our sanity and probably our marriage.
On other nights DH and I used to tag team, I would go to bed at 7pm, sleep, DH would be downstairs with screaming son, once he got him to sleep, about midnight DH would come to bed and I would get up when DS2 woke again. It’s hard as you don’t get to spend the evening with your partner, but we both needed to sleep so badly.
The only way I could describe it, is like being on a constant treadmill, and every morning I would think, oh no, another day. My DS2 did improve a lot after 7.5mths, but he still got in our bed every night without fail until he was 4!
MIL was very experienced with babies, she said she had never known another baby like DS2. I was considering a third before he was born, as DS1 was such a contented baby, but after DS2 a third was out of the question, no way on earth.
Good luck OP, sending hugs.