Infant With Difficulty In Falling Asleep At Night, Curdy Milk Vomiting. Suggest Remedy

Hello... my child is 4 months old. she is absolutely normal in the mornings. but in the nights she cries a lot. from 12.30 in the night she starts crying. i have to hold her and keep walking to calm her the whole night. she feels very drowsy but she does not sleep. when she dozes off after a long time, when i put her on the bed she immediately cries and wakes up. she has been vomiting curdy milk after feeding since 2-3days. she cries as if in bitter even while in sleep. she has been hardly sleeping for 30 min that when i lay her on bed she wakes up crying and takes a long time again to sleep. plz help me.