Yes, idiopathic just means they do not know your cause. You might find a cause if you find other doctors.

Start with diet and cutting sugar and junk carbs, check the A1C in a blood test. Also, you can check glucose level after meals at one hour and two to see what foods you need to stay away from. Potatoes, sugary drinks, rice, breads.... Even if blood sugar level is always good, cutting these are always good for the nerves.

Cutting out gluten is good to do also.

If you find an integrative MD that knows the blood tests to give, supplements and diet information, it would be great. So many things you can test for with vitamins, etc.

Always stay hopeful. Everyone is different and taking good supplements, eating VERY good, organic foods, greens, not eating junk, staying away from chemicals like things you spray in the air, cleaners, etc, meds that might be a problem... all kinds of things we can do to help the nerves get rid of toxins, get circulation and blood flow so toins can be carried away. We can just do all that is possible. Minding my Mitochondria is one book I really like.

Learn all you can about nerve health. This is a great place!