needle phobias arent trivial but are usually solved.
Try deep breathing, and dont think about the needle at all piror to the appointment, use distraction techniques. That is think about anything other than the needle.
If the matter is so serious that you are likely to be in deep anxiety prior to the test, then try some chinese remedies... (dont knock mit they work) for anxiety. If the anxiety is still incapacitating your doctor can prescribe some valium in small doses which should do the trick