I appreciate your response immensely. My cyst is also on the left side of my brain and is large. The first dr's i seen just dismissed this as the cause, saying balance is at the back of the brain not the front however as you have mentioned yourself I discovered that motor skills and sense of space is co ordinated at the front in the left temporal lobe. I had a shunt placed inside my cyst about 5 weeks ago and the vomiting has reduced slightly but I am still vomiting 2 or 3 times a day, my balance is so disabling I can hardly walk or stand on my own. The cyst is about the size of an orange. I am back to see the surgeon in 2 weeks. From what you say about it taking 2 months I may have to wait a number of weeks or months before It does it's job, i hope this is the case as I do not want to progress to having the op where they remove most of the cyst.