Hi and welcome to the Chiari forum.
First...the ringing in the ears is very annoying, but not a reason to get surgery, and it may not alive the symptoms....surgery is to restore flow and slow progression....and hopefully help some symptoms....
Make sure u go to a true chiari specialist not just a NS that will do chiari surgeries...there is a big diff and u will want the better of the 2.
We do have a list of Drs for u to research, the list is not meant as a referral, just a means to help u get started on ur research-
http://www.medhelp.org/health_pages/Neurological%20Disorders/DOCTORS-LIST-FOR-CHIARI-SYRINGOMYELIA/show/1062?cid=186
Pregnancy can trigger symptoms to flare....u may have had symptoms b4 but not as bad and may have attributed them to something else...but the strain of natural birth can and will cause this as will a MVA, coughing, sneezing.....or a roller coaster ride : (
There is the Chiari Institute in Great Neck , NY.....and a few others in NY as well....check out the list and the Drs to see which one is right for u : )
"selma"