OP - I am now the happiest mother in the world after getting rid of the dummy.
I kid you not, I was going in EVERY HOUR to put the dummy in for 6mo ds - he had it since birth and it was a godsend in the early days as he would feed and suck for hours.
However, it was actually having the adverse effect - keeping him awake! We were in a cycle of him needing it to go to sleep then waking up as soon as it fell out - he was literally in 1 hour sleep cycles all night and for naps.
I also gave him a very soft muslin cloth as well and he loved that so had both.
After yet another horrendous nights sleep I had enough and decided a month ago, that would be it. I binned all the dummies so I wouldn't give in and took him out for the day as I knew it would be hell to listen to him cry when I put him down.
This was a brilliant idea. We walked into town and when it was time for the nap, reclined the buggy and gave him his muslin. Yes, he did cry but it was less painful listening to it with the sound of traffic, wind etc and I think that also distracted him.
Same thing for the next nap - reclined buggy and we were walking in and out of shops, he cried again but snuggled into the muslin and fell asleep.
For his last nap of the day I literally just drove around = again, the car noise and radio distracted him and he had his muslin to hold against his face.
So, that's how I weaned him - he had his three naps but out and about, so less distress for us both. I promise you that night after crying for 10mins (I kept going back in and stroking his face and the muslin against his face) he fell asleep and slept through.
His sleep has improved 100% - he sleeps though and still has a comforter in the form of his muslin - safe, soft and breathable.
Also, they're better than a special toy as you can never lose a pack of 10 of them (the M and S ones are soooo soft!)
Good luck - it was the best thing I ever did. Sometimes he sucks the muslin, sometimes just snuggles up to it - it may help to wear it first in your top or sleep with it so when you take away the dummy and give him the cloth, it will smell of you.
reflux: ask the gp to give you ranitidine - don't leave until you have a prescription for it!!!