Me too have been getting up at night just to put the dummy back in. DD is now seven and a half months. The last two weeks she has been waking up less during the night, so it is getting better.
What advice I have to offer is not so helpfull maybe, but give it a try - it worked for me
I used to put some gliserien on the dummy each time she woke at night. That would get her to sleep in 5 seconds flat and would stetch out the times she wakes! So I started putting on less and less, until last month. ( Now I only use it when she is really rowdy and we are in the shops or somewhere - not anymore at night. ) At night I only pop the dummy in. Now I am starting to just tap her and saying shhhhh hun and only putting the dummy in when she really wants it. (opening her mouth when I lightly touch her lips with it) Sometimes she press her lips together, so I don't force her.
I think she will get settled by herself when the time is right, only hope it sooner than later for you! I know how totally fed up you can get when you need to get up just to put the dummy in.
Hope this helps! Good luck!