How do I find a way which doesn't require intervention every hour at night
Unsettled sleep can be because of either general over-tiredness or general hunger. Not in that exact moment, in the cumulative effect I mean - so not getting enough calories over 24 hours (if hunger) or not getting enough sleep consistently over the last few days.
Good sleep promotes better sleep. So the more sleep a baby gets, the less fretful that sleep is and the deeper it will be - which means less likely to wake in sleep cycles through the night, more likely to have chunks of sleep. Compared to an over-tired baby, who is harder to get to sleep and finds it very difficult to stay asleep between sleep cycles.
There are other factors as well. It is believed that the reason for humans sleeping in sleep cycles is because when asleep, we need brief periodic "environment checks". Left over from hunter/gatherer days, this is a check that all is safe and as it was when last conscious, when going to sleep. In adults this may be just turning over in bed, shuffling and going back to sleep.
In children, the "environment check" can work as it was evolutionary meant to. Child wakes briefly and is barely conscious (could go back to sleep) but notes that he now feels less safe and secure than went going to sleep. So rather than a shuffle and back to sleep, he will wake fully. This may be a baby who was in your arms being rocked or breastfed when going to sleep.
Starting to dream about hurting myself just to get away
Oh rrra, can your partner help? 
Is there anyone else who could give you a break in the daytime? A friend or relative? If you ask for help, you will be surprised how many people come sprinting to offer anything they can do.
It might mean then having a bottle of formula (every now and again for your sanity is not a problem) and a dummy and taking baby on a long walk for a few hours.
Can you co-sleep for daytime naps?