DD has silent reflux and she was diagnosed at about 3 weeks from memory and had it from about week 1. If you think there is something going on get a 2nd opinion. Go to a Dr and ask for a refferal for a paed. I'm glad I persisted. MCHN, MW's etc all told me it was normal newborn behaviour. She would scream for 8hrs non stop, night after night. We ended up in emergency a few times and she was finally diagnosed with silent reflux and put on Zantac which has been our saving grace. I say go with your mummy instincts and if you think it's not right then take it further. Hope things improve for you, hugs.