I've read so many of these threads from others, but none seem to exactly match our situation so I wonder if anyone might be able to offer any help/advice. I'm due back at work (full time) in exactly a month and if things haven't improved by then I'm going to really struggle 
DS is almost 7 months and as a newborn was an amazing sleeper. He'd go down in his next-to-me crib when we went to bed at 10ish and sleep through until 3/4, have a quick feed and go back to sleep until 7. This all changed at 8 weeks old, when despite us changing nothing else about his routine, he started waking up hourly through the night!
Initially we thought introducing more of a routine might help, so we brought bedtime forward (gradually) to 7:30/8pm and did bath, story, feed and then into his crib, but it didn't make any difference, he continued to wake hourly through the night.
Other things we've tried:
- DS has always been combi fed with one bottle of formula given by DH when he gets home from work. We changed the formula feed to the last one before bed in the hope he'd sleep longer - didn't work
- Putting down drowsy but awake
- Feeding to sleep
- Rigid daytime routine with set nap times, walk times, playtime etc
- Days where we just go with the flow
- Earlier bedtimes
- Llater bedtimes
- Giving a dummy, which DS accepted for naps during the day but for some reason not at night. Whenever we've tried to give the dummy if he wakes at night, he becomes even more agitated and won't settle again until he's had a feed
- DH doing the bedtime routine/night wakings. DS just doesn't settle well for him and refuses a bottle altogether in the middle of the night. The longest I've managed to hold out was an hour and a half of DH holding and rocking him without success before I caved and gave him a feed so he'd go back to sleep
We moved him to his full size cot at 6 months after he outgrew the next-to-me and we thought lack of space might actually be disrupting his sleep. If anything the cot seems to have made things worse and he's sometimes waking every 30-45 minutes tossing and turning and getting himself caught in the bars. I never wanted to cosleep but have resorted to doing so over the past few weeks just to get any kind of sleep myself. If anything this really hasn't helped DS as he's even more restless and unsettled, but at least I can sleep through some of the feeds.
I feel like there must be something really obvious I'm missing but I'm so tired these days I'm struggling to see the situation clearly anymore and just concentrate on surviving each day the best I can. The one thing we haven't tried I guess is moving him to his own room, but I've been trying to avoid it if I'm honest because if his sleep is still as bad as it is now, it's just going to make life even harder than it already is traipsing across the landing 8-10 times a night.
Any help would be very gratefully received!
Sorry it's long 