If you're down to one ounce and he's waking up more, then he's hungry.
My daughter did not sleep through the night until after she was 2. Years. Was I exhausted? YES!!! I tried lots of things and let me tell you the night we tried "cry it out" and she cried from the time she woke up at 1 a.m. until I finally had to get up for the day and admit "defeat" at 7 a.m. That little girl stood in her crib and cried, half asleep, on her little feet, for SIX hours. Did I get sleep? Um,no.
My daughter did not (and to an extent still does not) have a good self-soothing mechanism. She never took a pacifier, never loved a stuffed animal more than others, and she could have cared less which blanket was on her.
My advice would be to look at his self-soothing; does he have something he loves that can be in his crib? If he doesn't, find something appropriate (clearly not a large blanket at this age, but maybe one of those "taggies," and every time you comfort him and feed him and love him put that item with him. Make it part of your routine of soothing him. Then wean your behavior out of the picture until the item is something that soothes him and he's got how to do it on his own.
(Yes, that could cause a problem if the item is lost...so I'd make sure you pick an item that can be easily replaced, or have multiples. Yes, you may have to wean an 8-year old off of a "blankie" but that's way easier than operating on no sleep. Plus you can reason with an 8-y.o.)
One last thing...I agree with the poster who said let the expectation that he should be sleeping "all night" go. He's doing what's right for him. He's not some malicious being whose plotting to destroy your sleep. Count yourself lucky if he sleeps 5-6 hours at a stretch and go from there. And when he goes to bed, you go to bed. Get all the stuff you do after he's in bed done before he goes down so you can too. Get caught up on your sleep and then go from there. And take turns with Dad getting up at night.
Good luck!