A great sleeper turned BAD! How to kick feeding to sleep through the night... help please!

[Ab31]

Hello!
My 12 month DD was a brilliant sleeper from the word go until 10 months. She' suddenly started waking 4 or 5 times a night. The triggers were her top teeth coming through which has stopped her sucking her thumb and crucially DH going to work abroad for a couple of months. While he was gone I got into the habit of B/Feeding her back to sleep everytime for the sake of trying to get some sleep myself. Now DH came back on Sunday and surprise, surprise she wont hlet him settle her at all as she now needs boob. Arrrggghhh. Causing stress gallore! I feel guilty, he feels inadaquate and nightime is no longer relaxing. I wanted to stop b/f after her birthday (next week) but here I am with her needing it more than ever. How do I get her off the boob at night? Do we just go cold turkey and not do it whatever - even if it means a week of no sleep? Or if I go with it, will she stop naturally? It's the only way at the moment to get her back to sleep and it's so annoying as she never used to wake up at night at all so it's never been an issue before.
Also does anyone have experience of thumb suckers losing then finding it again? I\m sure that would help as she wont take a dummy....
Help!
x

I have absolutely no idea how you will achieve this whilst co-sleeping

Yes, of course you are right, PTIYPASI. But we are trying to work on the little things before moving on to the big things like sleeping back in his cot. So starting with the day-time naps, I am now putting him down in his cot while he is still semi-awake. He kicks and thrashes a bit, but then sucks his thumb and drifts off. Tonight we will treat going to bed just like another nap - putting him in his cot initially. I have no doubt he will end up in our bed fairly soon (he has been in his cot now 40 minutes, and DH is walking him back to sleep already for the second time since putting him down for the night). In this way, hopefully we can equip him in some measure for eventually going through the night in his cot on his own.