Hi and welcome to the Chiari forum.
I know this is a difficult time trying to figure out what is going on, and to have conflicting issues as to what u may or may not have is very frustrating.
All I can suggest, as we have had others with the possible MS dx and it was Chiari along with syringomyelia (syrinx) not MS as the symptoms r so similar and Drs r not willing to accept the fact Chiari does affect people...it is not well known, but it is not rare, it is Drs that know and understand the condition that are rare. Far too many have Chiari then have MS, even those Dx with MS r finding it was not MS but chiari they had.
May I ask is ur syrinx in the cervical spine?
I am sure u had a brain MRI by this point....do u have copies? how about the report? If not, request copies of each.
Did they do a LP on u yet?
If they r planning to do one, make sure the tech doing the draw is aware of ur syrinx and that u may have Chiari so they draw slowly as a fast draw can pull ur cerebral tonsils down and create more issues for u.
I know a few have had both Chiari and MS and have gone to the MS forum here on MedHelp....redflame is one that was a member here and there, but posts there and not here ne more.....so she may be able to offer u some insight.
Here is the link to that forum -
http://www.medhelp.org/forums/Multiple-Sclerosis/show/41
I looked and Lois "RedFlame" has not posted since April of this yr....not sure what is going on with her...but u can always send her a PM and she will get an e-mail letting her know someone is trying to contact her.