Has anyone used this? How long does it take to work? DD is 5 weeks and has been suffering nasal congestion which has gradually been getting worse. She was seen by an ENT Friday and diagnosed with silent reflux. He prescribed omeprazole but I've not noticed any difference as of yet. If anything the congestion is worse and she was very unsettled from 4pm-12am last night. Has anyone used omeprazole for their babies reflux?