@notarisingfan I've been there with intense sleep deprivation. My son is almost 5 and, like a previous poster, has some additional needs.
Sleep has always been awful. And I do mean awful. People who haven't been there just can't physically understand how it feels. So I really do feel for you and I don't blame you for considering the extreme options.
Just to say, we tried Ferber with ds at 11 months old after all gentle methods had been rendered useless. He hated co sleeping too. We followed the book carefully, had a solid plan etc. It didn't work. He wasn't "self settling" at all, he was just screaming himself to exhaustion and we felt awful.
I physically couldn't do full cry it out, I know in my heart it wouldn't have been right for Ds. He's a very anxious, sensitive child and has genuine struggles with relaxing enough to sleep because of how he is wired.
What I will say is, once I let go of "fixing" things and relaxed, that in itself helped. We started Fixing other things like how to make early starts easier, how to make the house run easier for days we were exhausted. From 8-18 months I sat in a travel cot with him on my lap them moved him off and climbed out 🤣 At 18 months we took the sides off his cot bed and I'd lay with him until he went to sleep, each time he wakes too. He now sleeps in a small double, I read or we listen to an audio book until he's asleep and he very often sleeps through. If he needs me in the night we've got plenty of space and he often just goes straight back off tbh. Things like a banana before bed, child safe magnesium/lavender foot cream, routine etc really helps. Fresh air after tea if possible.
Generally I'd say things improved massively at 3 (I know, not consolation to you now) then again 4. He's almost 5 now and started school in September, I hesitate to say it out loud, but his sleep can now often be comparable to my friends children, sometimes better.
I'm not saying do or don't, I'm not saying "just wait 4 years" I'm just saying I understand how you feel and I hope things improve for you soon, one way or another.