Change formula or not?

[Em1996]

Looking for similar experiences/ advice-
My 8 week old seems to be in discomfort for weeks, showing signs of silent reflux , struggles to sleep on back doesn’t sleep longer than an hour without waking up in discomfort, crying out in pain, always squirming, grunting ect- he also only poos every 4 days but with normal consistency, not sure it this contributes to things as he can struggle to pass wind at times. We are also using coleif but not sure if they are doing anything.
Gp is going down the route of treating reflux firstly using a thickener-
I am not convinced and gut is telling me to change to comfort milk but also don’t want to make things worse for him!
what are peoples thoughts/experiences with changing to comfort milk or maybe reflux.

Ours had reflux. Gaviscon helped but didn't want her to be on that long term. We changed from Cow and Gate to Aptamil and helped massively. The thicker milk didn't help and it smells gross and is disgusting to clean out of bottles! We put a couple of books under the moses basket to to tilt it- HV said this was OK so long as they were under not in basket.

Has GP discussed the possibility of either Tongue Tie or CMPA?

Thanks for your replies!
GP didn’t want to know about tounge tie-
howeve looking into he defo does have tounge tie explains why I couldn’t get latched BF and difficulties with bottle feeding! Will have to go privately

Have a look at this list of Tongue Tie Practitioners