Hiya,
Your ds sounds similar to my dd, who's now 18 months. I used to get her to sleep on the boob, put her in the cot, she'd wake after 45 minutes and take another 10 mins on the boob to go back off, then she'd sleep till about 3 or 4, at which point I'd have to stay awake for a while to get her back off and usually ended up sitting on the sofa as there wasn't enough room in bed for all 3 of us as she kicks and turns sideways!
So I started making up the sofa bed before going to bed, and then bringing her into that when she woke and spending the rest of the night there. It did seem to help her go off quicker.
Since Christmas or so (so when she was about 16 / 17 mo), I have just slept all night on the sofabed with her, and believe it or not, she has now started sleeping through. I hardly really dare even write it, but she now generally sleeps around 10 hours without a wake, which is just incredible. Can't be certain if it's the proximity to me, but I do think it helps. Course, I still need her to go to bed earlier (currently around 10pm) and need to get her off the boob, but this is the most important thing to have cracked for all of us, keep your fingers crossed for us!
I've got into dd's cot in the past too, and never dreamed I'd be sleeping in a separate room from dh, but we all sleep better for it, so we don't plan to stop JUST yet!
Good luck, and I really hope he gets better soon, that always makes it soooo much worse, doesn't it.