Years ago, in a former life as a journalist, I did a piece on cranial osteopathy for babies and children at the Ostephathic Centre for Children. What I saw was near on miraculous for some babies (and their stressed parents). I will never forget watching one baby who was red-faced and howling and although the osteopathy was almost imperceptible, the baby stopped crying after five minutes, let out the biggest sigh and was then completely calm. It was the parent who then burst into tears! The osteopath thought the neck had been jarred during birth and was causing discomfort and distress. It was incredible to see so in your shoes, I'd definitely try it.
Here is a link to the charity which now offers services across London
https://www.occ.uk.com/
Good luck.