Hey Becky,
hi again
Understanding everything you have been through it does sounds like there is an element of pain there and that is what's hindering his progress in the independent sleep dept and constant waking. But having said that I think that he is old enough for to try a bit of gentle sleep training to see where it gets you and if he's just waking just the sameafter a couple of days, then revists meds and food intolerances.
Becky I forgot you are dairy AND soy free too right? I do suspect further food intolerances too, since your meds doses are within the adequate range, (although there is still room to move upwards) and his symptoms sound like discomfort at the bottom end. It sounds like you are really wanting to push for the sleeping training angle right now rather than the meds angle, so I guess what's required is coming up with a plan that you are comfortable with
I think you are getting close to getting him to sleep independently, especially when he is comfortable you are saying he just needs a little pat and is off to sleep. But what is stopping this is the waking, and that has nothing to do with independent sleeping. (Do you agree?).
If you have got him off to sleep by placing him in the crib sleepy, then given him a gentle pat so send him off, he will have awareness of falling asleep in the crib. So if he wakes after 35 mins I would not be thinking its because he realiseds he's in the cot and not your arms and hates it. I would think more along the lines of genuine discomfort. KWIM?
So again, if you want some results fast, the best results might be to up his meds... if he has further food intolerances, sometimes the symptoms can be masked by a higher does of meds... if the food intolerances flare up his reflux. I don;t knoeif you are up for cutting further foods.
As for as the sleep training plan is concerned, one idea is to place him in the cot sleepy for all sleeps, and pat him off the rest. If he loses it, do a modified PUP/PD where you pick him up and hold him all the way to sleepy again... the place back in cot. After doing this several times he will eventually wear himself out and accept falling asleep in the cot. My DS2 is spirited and doesn't accept being held much when tired now, he settles quicker by rolling around in the cot and losing it in there as opposed to me arms. It will be trial and error!
and just fall as Then only feed 1-2 times a night as you are doing now. Then you can see where it gets you.
Just my few thoughts.