I have, in the past few years developed major balance issues,I can't walk or draw a straight line,I've almost fallen several times,I have been to different types of doctors(regular,ENT,neurologist),had several different types of tests,MRI,tilt table, x-rays,bloodwork,etc,they all showed nothing, and tried different kinds of meds,none of which worked.Everyone I've seen says it neurological,but they don't know what's causing it.I was diagnosed with sleep apnea,and now I use a CPAP machine,but I still wake up with headaches,though not as severe as in the past.My dad has had 11 operations on his neck and back,but I haven't had back problems,and I'm shorter then him (he's 6'3,I'm 5'9)It's getting old,and expensive to be told "I don't know what it is"Can anyone help?.