Belle, big sympathies to you, as you can tell from my username here (and the hour at which i am writing this) i've been in similar straits, and looking back I'm not sure how i coped! My son is now 8 months and still not a fabulous sleeper (wakes 2x a night, thinks morning is 5am) but like your little one used to be evey 30 mins to an hour, with plentiful screaming thrown in for good measure. He had silent reflux, though was on meds for it, and was generally a v unhappy baby day and night. To cut a long story short it turned out he is intolerant to cows milk protein, so i went dairy free (under hospital guidance) and within weeks he was a different baby, happy, and sleeping longer between breaks. Just a though that maybe this is something you could look at, if you havent already? The way i coped was to go to bed at 8pm, so i got in a reasonable few hours before the wakings started, and to lie in at weekends a lot to tank up when partner was around. I could not nap when baby napped as he would only nap when pushed in pram outside so that was no good. I do think that some babies are good sleepers, and some babies just aren't. Try not to think that because other babies are sleeping through at 10 weeks or whatever youre doing something wrong if your little one doesnt, because, even once youve ruled out any medical factors, some babies just need a bit longer to get there. X 3-4 months of age is classic sleep regression time, and i know it did all sorts of bad things to my pals' previously good sleeping babies...but it did pass!