I'm very sorry to hear of all of your problems getting a diagnosis! I had similar issues with some very unusual migraine symptoms last year and I can relate. I felt like maybe I was crazy, like the doctors were making me feel. So frustrating.
Like Joy said, try to go with the flow. I know that is easier said than done where you are physically and emotionally right now, but it will help you.
Secondly - don't stop until you find a doctor that will listen to you. They are out there, but it may take a few losers to find the right one. I work in a medical clinic and the biggest thing I tell my patients is that you have to be your own advocate. You know your body better than anyone and you know something is wrong. It is the doctor's job to help find out what it is and help you fix it, not to tell you that you are imagining things or that it isn't as bad as you think.
Also like Joy said ... get the tests done. That is the one way to definitively diagnose the issue. It sounds an awful lot like GERD, which has many symptoms that folks don't even realize. The tests will prove either that it is GERD or it isn't. THen you can go from there.
There are lots of folks here that will support you, so keep us posted and we'll be praying for you in the meantime.
Kim the BBShopMom