I agree with Uppitycats. If your doctor is offering treatment, you want to seriously consider that. I have read many articles that state early treatment is extremely benficial. Also, why not start treatment and then go for a second opinion. That way you have not delayed treatment and you can see what another professional has to say about you. Good luck. There are several here with experience with betaseron so feel free to post questions you may have. It is supposed to be a very effective medication. Good luck and keep us posted as to how you are doing.
Love and prayers,
Here is one of those articles on beginning treatment at the CIS stage:
I can imagine that is this a difficult decision, and a stressful time in your life. Please take care, and let us know if we can be of any help to you.