I've heard so many stories about people who experience pretty severe anxiety due to GERD. It is certainly a strong possibility. GERD a disorder that definitely affects your health and quality of life, and it can be very anxiety producing.
I agree totally with Kitt. You need to continue to follow up with a doctor, and thoroughly discuss the symptoms you're experiencing. Hopefully you have a good family doctor/primary care physician who can help you with your symptoms. I realize that they're very worrying.
Good luck to you, Dibba!
I hope you find out what's happening, and get feeling better.