Hi there I am sorry to hear that you are having such a tough time. I am not sure of the brand that you are using, but it is possible that it is making her sleepy. The thing with reflux is that they are so overtierd from being on edge and not sleeping properly, that if they do have medicine sometimes it does cause them to sleep well. I don't think it is going to hurt her at all, but it is not going to do anything for the reflux.

If you are hearing wet hiccups and unhappy all day then I would look at getting her on some reflux medicines as this is acid rising and it is causing burning in her oesophageous, medicine will not stop the reflux, but will decrease the acidity and stop the burning.

If it only starts at about 5pm for a couple of hours, it is generally colic (and could be complicated by the reflux) the best way to avoid colic to to burp really well at every feed. Use infacol in the bottles to stop the air, and Dr Browns bottles work really well at decreasing the amount of air that they get.

Hopefully this will settle down soon.