Hi and welcome to the Chiari forum.
First, I have no idea what mudd bogging is, but I am sure it is something that would be added to the list of activities to avoid.....
I also wonder if u might have Ehlers-Danlos since u have sensitivity to meds.....
The 12 mm is the size of ur herniation .....too many drs put too much stock in the size of the herniation...what is more important is an obstruction to CSF flow and overcrowding and shape of the tonsils......
I have a pic in my profile that can explain this to u......
http://www.medhelp.org/user_photos/show/178385?personal_page_id=197028&photo_collection_id=1369
U deff need to get to a true chiari specialist.....u need more testing to rule things out like a syrinx, tethered cord, ehlers-danlos,sleep apnea, a CSF blockage and overcrowding......
We have a list a drs compiled from our members....these were their drs, and the list is just that a list and a starting point, not a referral.....
http://www.medhelp.org/posts/Chiari-Malformation/LIST-OF-CHIARI-SPECIALISTS/show/1293483
Please do research to find the right dr for u.
We r happy to have u join us, but not happy for the reasons that bring u.
"selma"