I have abdominal pain,nausea,difficulty in swelling causing occasional choking?

I have abdominal pain,nausea,difficulty in swelling causing occasional choking cough.metal mouth taste,burping and today I collapsed in the kitchen.What could it be.i also have a bloated stomach. I have been taking the gaviscon I’ve had previously but hasn’t had any effect.

Age: 60
Female
Medications: Lamotrigine,simvastatin and ramipril.i
No
General Information: I did have an endoscopy quite a few years ago for hiatus hernia and was put on omeprazole.I am epileptic.