adgirl, good luck with the doctor's appointment -- let us know how it goes. As Steve said, getting a diagnosis is good news -- it is the precursor to getting the problem fixed and going on with life. That's the common thread here. But it is perfectly normal to be scared at first.
BTW, in answer to a couple of comment, we DO have a glossary of terms and acronyms here. Check the "sticky" above , or the "Reference Sources" topic.