King of Orange, I don't think it's detrimental to drink a lot of ginger tea. Ginger can be really beneficial for nausea. I think if you have a lot of ginger then it can be constipating, but hot tea by itself has a bit of a laxative effect, so hopefully it all just balances out!
For those who have mentioned peppermint tea - peppermint is great but if you have GERD then you shouldn't have peppermint. I was told that it can relax the valve between the stomach & esophagus, which in turn would allow more reflux to come up. That makes me sad because I love peppermint tea, but I have severe GERD so I can't do peppermint tea anymore.