Folksoul, your situation sounds exactly like mine.
I have GERD (or as my GP calls it Acid Reflux) and my sympoms are exactly the same. I too have been upto the ER becuase all the pains in my chest lead me to think i was having a heart attack, thankfully all the tests came back fine.
I have been on meds for GERD for almost 5 weeks now and after 3 weeks i thought it was easing off but the last few days my osophegous area has been hurting so much and i have lots of pain under the left side of my chest and my left shoulder blade again.
I too am gettin shooting pains down my left arm but for me its not helped becuase i have a thyroid dissorder called Graves Disease which is weakening all my muscles anyway.
The bloated feeling doesnt help matters at all and i feel like i could have another anxiety or panic attack at anytime
I hope we are both feeling better really soon