Take it step by step if you can. Do you have symptoms? Maybe the test will lead to being treated and getting some relief. Once you know what is going on, there are several forums here on Connect where you can find some folks in similar situations. gravity3's suggestion to make a list of questions for your doctor tomorrow is a good one. If you have time to yourself today try and do something you enjoy to distract from the anxiety. I find a little gentle exercise can help me. Check in tomorrow?