God may cure you, but you also have to do something about it. You have to pray to Him for guidance and He will lead you to the right treatment. The healing rarely happens miraculously.
Anyway, there are some pages on Internet that say more or less the same thing, to eat heatly, avoid salt, industial suger, coffe etc. They also propose some remedies. Here is a good one
http://www.regenerativenutrition.com/content.asp?id=401Reading about this disease I remembered that when I was little I had several episodes of vertigo, dizziness, nausea&vomiting. I could't open my eyes or walk because the whole room spinned with me (literally). However, with time it passed away... and I am perfectly fine now.
I don't know any specific cure for this, but I may recomend some things that will help indirectly. (I also take them)
First, tell your friend to take Omega 3. It is essential for the brain, all of its functions and helps regenerate the nerves. Omega 3 is naturally found in fish, seeds and nuts. However, oceans are highly polluted and big fish usually contain high concentration of mercury. Thus it is better to eat small fish or capsules. The capsules normally do not contain any mercury because in the process of extraction, every residue is removed. In the brain there has to be a balance between the 3-6-9 Omegas. The ratio has to be somewhere between 5:1 to 10:1 Omega 6 to Omega 3. Unfortunetly, due to our modern living our diets are more rich in Omega 6 and very low in Omega 3 and thus the ratio is abnormal.
Second, tell your friend to take bee pollen. (that if he/she is not alergic to it.) It is natural and boosts the body functions. Take 1- 2 teaspoons every morning before eating (if you take granules, keep it under your tongue until it melts and then swallow it.) during 6 weeks; 2, 3 times a year. here is a good page explaning why it is so good.
http://www.benefits-of-honey.com/bee-pollen.html