It might well be silent reflux. My little boy cried constantly, refused to feed, was in such distress it was horrendous. We were told by at least three docs that he had reflux and we just had to live with it - he would grow out of it etc.
In the end I got him referred to a Paed gastro specialist, who recognised straight away that his problems were severe. He had an endoscopy at 8 weeks old, and had nasty acid burns in his throat and oesophagus. We tried all sorts of formulae for him - Pepti, Soya, Nutramigen etc, but this doctor put him straight onto Neocate, thickened with Carobel. Over time it's been established that he has a bad cows milk protein allergy (and can't tolerate soya either as the proteins are very similar). The Consultant has said to me that he has seen an increase in the numbers of children with both reflux and cows milk protein allergy in recent years, though it's uncertain why.
Many children will grow out of both the reflux and the milk protein allergy. My son unfortunately has not so far. He's 17 months old now, but is absolutely fine as long as he is medicated properly and has a totally dairy and soya free diet. He takes domperidone and omeprazole (ranitidine didn't work for him) and still has his neocate and carobel. He eats a good diet of meat, fish, fruit, veg, pasta etc - but if we even slightly go off track (eg a few chocolate buttons) we know about it.
Thank God we found this doctor - he changed our lives in a matter of weeks (it took 5-6 weeks for the acid burns to heal and the neocate to take effect) He took my baby seriously from the offset, and we still see him every 4-5 months along with the paed dietician, who makes sure my son gets all the nutrition he needs.
I suppose there are steps to go through - first my GP prescribed infant gaviscon which did nothing, then he referred him to the paed day unit at the hospital where a general paed prescribed ranitidine and changed his milk onto nutramigen - again no luck. I took him to A&E once as I was so upset with his condition - they admitted him to children's ward where very little was done. Nobody even told me about this paed gastro bloke - even though he works in the same hospital!!! I found out by chance through a neighbour who works in social services, and I went to my GP and demanded that we be referred to him. The rest is history.
I hope this is helpful - what I'm saying is that not all doctors recognise silent reflux, or realise the severity of it. I dread to think where we'd be now if we hadn't pushed to see the right person.
Good luck. x