I've had heartburn many times. It was never accompanied with voices. Nor did it feel anything like the Holy Ghost. It sounds like you are desperate to believe that your reality is more real than mine, that your lack of perception somehow trumps my perception. Yet many times the Holy Ghost has led me to do things that have changed peoples lives for the better. At first I kind of fought with it, but now I've grown to trust it. It has also revealed to me future events, that I have watched take place. That is rare; I'm not the mage of all things future; but it has proven itself to me. My faith consists of trusting a being that does exist, and not in believing in a being who may or may not exist. It has also taught me things about human nature, and revealed the meaning of obscure scriptures, and even helped me shop. It lifts me up when I'm depressed, and inspires me to achieve more than my own nature would conceive. It has filled me with indescribable happiness on occasion and is a constant source of encouragement. Without it, my life would be but a shadow of what it is, and my past a shadow of what it could have been.
I am nothing special. You too could lead a life where you knew there was a God, a life where you would be continually inspired by the Holy Ghost, touching the lives of others deeply and profoundly. Your peers might then believe that you are completely crazy, but one person - you - the person that matters, would not. You could know just as assuredly as I know, that the universe is not without love, and not without intelligence.