I really don't think that's GERD. Is it just when you stand, do you feel dizzy and/or nauseated when that happens. Are there other triggers you have noticed?

That sounds more like anxiety/panic attack! The lump in your throat is because of Gerd

I experience systems like this as well but it isn't from GERD my doctor and I are trying to diagnose it. I would suggest bringing it up to your doctor and they can better help to discover if this is a more mental or physical health problem.

GERD does do this to me sometimes. For me it is Esophageal Spasms (kind of like my throat is cramping) and they feel just like I've been told a heart attack feels. The spasms give me a tight chest, shortness of breath, and intense pain. Sometimes they feel more like an air bubble sitting on my ribs. Long-term acid reflux control has helped immensely because this can be brought on or exacerbated by uncontrolled GERD through the acid damaging the esophagus. I use pantoprazole daily and it helps so so much.

I have the same issue but I also have vertigo and asthma so all Dr's I've asked about it say the dizziness is from my vertigo, sheet if breath is from an asthma flare up amd then the lump in my throat is from my acid reflux. They just hit at all the same time

Yes, Bcs it gets into your airways and causes asthma like symptoms. Also known as airway reflux. I get the same thing sometimes.