If you are not comfortable about a Lumbar puncture right now I would ask about having evoked potentials done. Just as Gretchen stated, it can show the disease. I've been diagnosed since 10/2008 and I have not had a lumbar puncture.
If your dr still insists on a lumbar puncture I would suggest that you gather as much information as you can: Who would do the procedure, where would it be done, what are the procedures of this test, are there options for you as far as twilight sleep or anxiety meds to help soothe your nerves, try and find out if anyone else has had it done there and get in touch with them. The best answers can come from the patients that have experienced this test.
Remember, you can always get a second opinion.
Keep in touch and let us know how you are doing!
Pray without ceasing. In every thing give thanks: for this is the will of God in Christ Jesus concerning you. 1 Thessalonians 4:17,18
Just started Copaxone 06/2009
Monthly IV Solumedrol since 03/2009
Diagnosed RRMS October 2008
ACDF C6/C7 May 2008
ACDF C5/C6 May 2005