kbaby, we discussd before on another thread about your baby having what the Americans call 'high needs'.
One thing that might help you sort out what is happening is to ask yourself 'what would keep dd happy and not crying?' If the answer is 'to be kept close to me in my arms all the time - 24 hours out of 24! - feeding and snacking, and never be asked to go to sleep in a crib or cot and never be asked to sit in a chair' then it isn't wind or colic or anything physical like that. It's the normal behaviour of a baby who has especially acute needs to be close to mum.
Babies like this are demanding and exhausting, because they do cry, still in your arms....they need to be actively soothed and rocked....but they are not like this forever. Sometimes, like your baby, they will have a time when they do tolerate being sat somewhere else, and they gradually learn that other people's arms are ok, too.
It sounds as if one of the worst aspects of this is the way it takes away your confidence and makes you sad and bewildered. Being with other mothers at a baby group or breastfeeding support group can help.
I think the cranial osteopathy may be worth continuing with - some parents say they have needed several sessions.
Baby massage is also very helpful and soothing. You can do classes in this, but you can do it without classes as well. The classes are good because they let you meet other people.