The anxiety I believe is not caused by the meds its caused by the fear of the pain.
Your taking the pills basically because either you were diagnosed with the GERD.
I have been two and notice the same as you some anxiet when I wake up in the morning.
The PPI do their job face it but if your like me all the internet chatter of how bad they can be
scare me to death. This is where I think the anxiety comes from. If your under alot if stress that could be a trigger too. This economy is bad and making alot of people sick with GERD.
Talk to your doctor and tell him/her what is going on.