Sleep issues with 7.5 month baby

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I need advice and handholding. Please.

DS's sleep has been bad for months but I've just put up with it (while getting more and more exhausted). He used to sleep for 4 hours at a time from newborn to about 3 months. Then he started waking 1-2 hourly all night every night. We stopped cosleeping and moved him to his own cot/room on 25th July. He made the transition fine, not waking any more than before, but no less either.

However the last few days everything has got so much worse. We've not changed his routine (dinner, bath, nappy + pjs, book then feed to sleep and put down).

He'll feed to sleep around 6:30 and transfer to cot ok. Then wakes every 20-45 minutes, generally settling easily. Until at one point in the night (9:30 last night) he just won't be put down. He falls asleep while you're holding him, but just will not transfer. He was up for 5 hours last night doing this. It just can't go on.

We're away on holiday on Monday till the following Tuesday, staying in two houses in that time. I'd thought I couldn't do sleep training before an upheaval like that, however I can't spend the next two weeks holding him.

WWYD? I'm ready to do CC but should I?

Dd was like this and our solution was just to cosleep for longer as I got more rest that way. Fwiw she just suddenly started sleeping better from about 11 months and we stopped cosleeping then - she always started the night in her cot and then I'd sleep with her from the first wake up/when I went to bed , and gradually that first bit of sleep just got longer. Try not to stress too much, a few months feels like an eternity at the moment I know but things will change whatever you do. If you want to do sleep training there are lots of different ways, there's a book called the 'no cry sleep solution' or something that some of my friends swore by.
For holiday I'd just go for whatever makes life easiest, cosleeping or having his bed next to yours.

I wouldn't do CC just before a holiday as the holiday could send you back to square one anyway. In your situation I'd probably cosleep through the holiday and then see what happens afterwards. FWIW it was about this age that my DD's sleep improved a lot.

I would co sleep. Might be teeth or sleep regression. Mine had phases like this but go back to self settling without using CC.