Hi David,
hope your little one is sleeping a little better.
I have some other thoughts that you might like to consider.
Firstly, just a note about reflux: My child was found to have reflux when about the same age as your child andstill has it several years later. It is probably caused by an allergy to cows milk , but could also be to do with an undeveloped valve , which allows stomach acid back up , which causes pain if she lies down too soon after drinking or eating. This was the main reason for her continuous waking when she was small. To deal with the problem a form of gaviscon , suitable for babies , was added to her milk in the evening and we took care not to give food or fluid too close to bed time. I would be tempted to explore this with your GP as it is far more common than I had realised but is rarely diagnosed.
Secondly, here is my other rather controversial solution :
Whether or not reflux is diagnosed : If your baby is a very "sucky" baby, even at 2 yrs or 3 yrs old then consider using a soother(dummy). I found when I placed two or three in my child's bed at night and watched her on a screen monitor the following happened:
1) went to sleep with soother.
2) soother fell out of mouth and in to bed when fell asleep
3) Woke a few hours later
4) she fished about for a couple of minutes looking for a soother
5) found it
6) she popped it back in her mouth
7) went back to sleep
..... and this pattern continued untill morning but no crying and after a week at no time did she fully wake up ( she semi woke and fished in her sleep)
Now I can hear all those gasps of horror from certain quarters who will tell you that this is shocking..... But you can bet your bottom dollar they have not had to cope with a baby or an infant that repeatedly fully wakes or the ill effects that this excessive waking has on a child at this age. Don't listen to the "this is normal" righteous brigade that has no better intention that to make a working parent feel guilty..... take advice from a very experienced paediatrician and one of those highly experienced nannies like Gina Ford ( Niether of whom would recommend dummies long term ) but who will really help you.
Now, the dummy was only temporary to get in to the habit of sleeping through the night (as a matter of interest always in a pitch black room) after getting the reflux sorted ( in all about a year ) it did not affect the teeth as it was only available to my child at night and only for a very few minutes when falling asleep and it was not addictive ( not many children past three would need one in this way ) and so long as it is only used at night then you will find it could be a very simple solution to waking . It worked as a way of breaking the habit of fully waking in the night many times and as a way of helping our child settle back to a deep sleep quickly so she was eventually unaware of waking in the night at all.
Obviously the professionals and Doctors must be consulted and their advice taken but our experience might be worth considering especially as these potential simple solutions have worked well for a number of infants that have experienced serious sleep problems.
All the best,