Hi Hayley, I've had this problem with all three of mine, the youngest being 3 months. My first used to have trouble feeding and spit milk out and cry while feeding, they prescribed gaviscon and this worked but he didn't put weight on too well until about 6-7 months. My second used to throw nearly all his milk back up, gaviscon didn't work and after lots of trips to docs I managed to get him refered where the prescribed ranitidine which helped lots but by this time his weight had gone down lots (he was a healthy 9lb 15 at birth) but dropped down the centiles while he was suffering. Now with my daughted who is 3 months she started crying through her feeds at about 4 weeks, one doc wouldn't give me gaviscon so I waited to see another one who did give it me (i told her i recognized the signs and didn't want to leave it) . She was still suffering but because she was thriving ( 9lb 7 at birth and now weighs 19lb 6 at 13 weeks) they wouldn't refer her, I told them they were being cruel and that cos she was putting on weight doesn't mean she isn't suffering. anyway I increase the does of gaviscon to two saches on my own (mum knows best) and she is fine now, its one dose for about 4oz and 2 for 8oz, she was drinking about 6 or 7 so I put 2 in 8oz, I ended thowing alot away but it doesn't matter now cos she is ok ( i told my doc when I went back that I had increased the dose and she said well done, lol). keep pushing for a referal if the gaviscon doesn't work.
Hope you go ok and if you have any questions please get back to me. x