Oh it's torture isn't it. Nearly broke me. At the time, it felt like it had. But I'm still here, intact... and at 14 months, he SLEEPS!!!!!

What worked?

Cutting out dairy from my diet dramatically reduced his wind. He went from a miserable, grunty, windy non-sleeper, to just a frequent waker, frequent feeder, play for a couple of hours from 1am kind of kid!
Tummy sleeping (as above, I certainly wasn't comfortable with it, but I was also desperate and it helped. I'd put him back onto his back as soon as I felt I could handle the more frequent wakings)
Survival tactics - kicked DH out to have the whole bed to manage co-sleeping and swapping sides all night, some fairly 'slack' parenting of DD (then 2.5) for several months, minimal domestic, social or mental output
Night weaned (10pm to 4am)... he still has the 4am feed, at 10 months. By my ideals, this was too early and not the most gentle approch, but I had to weigh up the costs during the day of my exhaustion and failing mental health
Holding onto hope. I remembered that DD's sleep significantly improved at about 12 months... and for the most part, I just held on.

Huuuuugest hugs Hun. Hold on. Be gentle on yourself. Know that one day, hopefully not too far away, you'll have five straight hour's sleep and it'll feel like you won he lottery!