Hi and welcome to the Chiari forum
I agree with the above poster you will need more testing to see what else is going on...it is possible the bad results of decompression were not due to the type but knowing what else was going on for that person...and having the right Dr is KEY ! there are many Drs willing to do the surgery as that is how they make a living....HOWEVER, you would not take a foreign sports car to the local mechanic to fix the transmission, you find one that works primarily on foreign cars transmissions....do the same with yourself!
Have more testing to see if you have an obstruction of CSF fluid and other related conditions....
Most of ALL listen to your body as to what you can or can not do, we do have a list of activities to avoid...but some of us need to restrict even more depending on what all is going on with us...we all will be affected a little differently then someone else...so what works for one may not work for someone else...same with Drs...this is why we do not refer Drs only supply a list for you to research.
We also have a list of questions for the NS...use the search this community feature to locate that info. Or ask for help if you have trouble locating it.
Know you are not alone...
Hi & sorry about your new Chiari diagnosis:-( I know that this is scary to deal with, but sounds like you will definitely need more testing (MRIs). The surgery is usually done to restore CSF flow.....so do you know if yours if blocked?? CINE MRI can determine if CSF flow is blocked. Surgery doesn't always relieve the migraines, but in my case it did decrease drastically once the CSF flow was restored. You will also need to have MRIs of the entire spine to rule out Syrinx & other problems (Syrinx usually requires surgery to prevent further damage to the spine). I would suggest also to review the "activities to avoid list" on this forum. Some activities will trigger the symptom cycle or enhance them.
Another bit of advice that I can give you is to find a Chiari specialist!!! With the knowledge of a specialist, you will feel much more comfortable in your decisions for treatment. I am 7 weeks post op & actually had a little set back due to a CSF leak (surgery again on June 2nd)-------BUT I still feel way better than I did b4 & I would do it all over again!!!!!! I will ALSO say that I had a lot more symptoms than just headaches b4 I agreed to surgery (I was dizzy for 7 weeks, could barely walk & lost hearing in my right ear). You need to be your own advocate since you know your body the best. Do not do the surgery if you don't feel its the right choice. Wishing you the best!!!