I am sorry that you and baby are going through this Adel
It is terrible, my first LG had reflux and it was not an easy road. We ended up putting her on medication, Nexium.
We also found a definite link between reflux and cow's milk. Not so much the lactose, but the cow's milk protein.
I breastfed so I cut out all dairy from my diet which helped a lot.
We breastfed when reflux was at its worst and we only gave her Nan HA when she was 10 months old, and at that point I think she outgrew the reflux. We did hear good things about the Nan HA, apparently the cow's milk protein is modified so that the baby's body does not have an allergic reaction.
For some reflux babies it helps if you keep them upright after feeding, it did not really helped all that much for us though. All you can do is hold them close and try to comfort them.
Sorry for not being able to help that much, all I can say is it does get better