Hi,
I had same thing, Nexium also stopped working for me. Went back onto
Ranitidine 150 mg twice a day. The evening tablet take at about 9 pm.
Going to bed I take 15 ml: gaviscon mixed with a small amount of milk.
I am now returning to ' normal '. Have just had a really bad time, apart from the heartburn/reflux/throat/voice problems I also had gastritis.
Now awaiting blood results for H. pylori. You never know that might just be well making things worse.