Hi when possible go bare foot..as walking in bare feet can help with balance issues or wear a flexible soled shoe....with warmer weather finally a promise with a change in season this will be easier sooner then u think.
The other thing u may want to do is look at the list of activities to avoid with Chiari and Syringomyelia as it will help to not do certain things as they can trigger symptoms to flare.
See the Health pages for this article -
http://www.medhelp.org/health_pages/list?cid=186
U can also have ur PCP do blood labs to make sure u do not have ne low levels of Vit D, B12, or magnesium and potassium.....as they can also cause dizziness , balance issues and HA's.