Welcome to Healthcare magic!
You have not mentioned whether you are taking any medications like prilosec
Most of your symptoms can be attributed to GERD.
can all occur with GERD.
There are reports that GERD can be associated with premature ventricular contractions ( which is the reason for the fluttering and missed beat you have).
I would suggest you have an EKG done for evaluation of fluttery heart.
For rest of the symptoms prilosec would be helpful.