Hi, I am no expert and am having to learn more than I ever wanted or needed about these horrid symptoms

Now, quick vent out of the way lol!
Your reflux could be worse at night for two reasons - Gravity works against you when you lie flat and secondly, digestion slows down at night.
Many of us have the thick, copious saliva, it's a normal vagal response to nausea, heartburn. I have this constantly, and have just started a post asking if anyone has this all of the time...
Kim