Hello
After going through this report I would recommend you these measures :
Try raising the head of your bed about 4 inches with blocks.It might also help to avoid eating or drinking for 3-4 hours before you lie down. To help control stomach acid one should not drink alcohol or drinks with caffeine in them or eat pizza, burger , spicy or greasy or fried foods.
As you are taking dexlnasoprazole , take it on empty stomach . Beside also take
rebamipide 100 mg 2 tablet twice in day on empty stomach.
Since this is a prescription medicine , so consult your gastro and discuss.
Now about
pericarditis , if your cardiologist suggest then deal accordingly but before any step , consult one more cardiologist and get his opinion.
Vagus nerve stimulation may be the reason of such symptoms but in my opinion these reasons also may be responsible for your problems.
1 Tension , no doubt due to these you are under tension but try to relax and recapitulate all thing .
2 As I have noted in my so many patient that some times over eating produces such symptoms so be careful .
Hope this will help you.