Oh dont be hard on yourself , it is so hard to know a baby has silent reflux because they dont have the vomitting etc of just normal reflux. I just explained off Liams symptoms for 8 weeks as fussiness, colic, intolerance to BM etc etc etc, until I finally did some reading up on reflux and went to see my GP.
Let me know if you need an ear to listen, I can sympathise we are going through it too!