Dear Confused in CA,
First off, please know that any doctor who scolds you for doing research is one who is way behind the curve in seeing the benefits of having a patient who actively searches for information.
Though a lot of doctors appreciate having an informed discussion with a patient based on research, there are still a significant number who think that people convince themselves they have the disease they are reading about. Some patients do this, of course, but those who have more savvy research skills look for patterns, discover that many diseases can share common symptoms, and search reputable sites such as pubmed, NIH, NINDS (any .gov site is reputable), medline, university .edu sites, well-established clinics around the country, etc. The smart doctor will direct the patient to those reputable sites to save the patient from wasting time and anxiety plowing through misinformation.
Keep up your research, avoid doctors who cop an attitude about that, they will be of no use to you. Prepare yourself with notes before an appt., keep a symptom log, and it might be a good idea to refrain from sharing your research with a new doc until you feel comfortable that he/she will be open to it.
Your neuro exam is important, do follow up with that; an MS diagnosis is still, essentially, a clinical one. That means the physical neuro exam will reveal any abnormalities in strength, balance, coordination, and reflexes. Additionally, your description of symptoms and history will further inform the doctor. It is this exam and history that might prompt a neuro to order brain and spine MRIs, EPTs, and lumbar punctures. These tests are used to confirm a suspicion of MS. However, they don't always show signs of the disease in the early stages, so they might then track you with routine follow-up tests every six to twelve months to check for changes.
Your research has probably shown you that an MS dx most often involves a process of elimination. Many other conditions must first be ruled out, and that can take time.
Please do keep us informed about your test results, keep researching, and, of course, bring your questions and concerns here as often as you wish.
Kim