It's so hard when you're sleep deprived but i wanted to offer big hugs as i know what you're going through! you haven't 'stuffed up' at all!! It's fantastic that you're bf your little one but i know from experience what a dynamic and challenging journey that can be.

If you're looking for a book to read to offer some ideas of solutions, many on here recommend Elizabeth Pantley's No Cry Sleep Solution. I tried a few of her strategies, one of which was decrease the feed (in time) before sleep so that you feed to sleepy rather than sleep and then eventually he will be able to self settle. For me it was about changing the bedtime routine. So for one week, i gave a feed close to bedtime but then DH put DD to bed. Sitting in the rocker, lying in bed beside her, whatever worked - and kept offering a cup of water. It wasn't easy the first few days but became the new routine. Once he went back to normal work hrs, i continued the pattern of feeding close to but not at bedtime. so about 10 mins before going to bed. I also introduced a supper just before bed of porridge & or a banana to fill her little belly before sleep.

With DD1, it worked at around 16 mths and DD2 it worked at around 19 mths (she was far more booby dependent). I found with DD2 after a couple of weeks, she started sleeping much better through the night (up till that point it was 5 times a night EVERY NIGHT!!). TBH, it also coincided with all her teeth coming through and there being no more teething pain.

Sorry, i've gone on. If you want to change things, i would look at a few different ideas and strategies then engage DH to step up to help at night. He's had 2 years of more sleep than you so he can help out for a bit now until you find something that works for you. That's what i told my DH anyway!! Good luck!