Hi Orolibre

Welcome to Neurotalk (NT). Sorry I can't help with a diagnosis for your friend - that is best left to the medical professionals. NT is useful for information, sharing experiences and support.

Regarding your friend's symptoms I notice you posted under the Autoimmune forum - does your friend have an autoimmune condition?

Has your friend sought medical advice/treatment for the blackouts? It is important that he do so. Blacking out for several hours is a symptom that should not be dismissed.

Your friend said he "dropped all medications" recently. What medications was he taking? what doses? and for how long?

Regarding the possibility of some sort of neuropathy - There are over 100 different types of Peripheral Peuropathy (PN) with as many causes. It is a process of elimination to try and diagnose a possible cause (or causes). Idiopathic just means that a cause hasn't been determined.

If your friend hasn't had any examination or testing for diagnosis the best thing would be to see his PCP for a referral for further specialist investigation.
It would be useful if he was able to put together some sort of record or history of his symptoms and progression - include any medication changes and other possible interactions. eg tick bites, falls, allergies etc.

If you have any further questions please come back and ask. There are people on here, with more experience and knowledge than I have, who would be able to help. All the best for your friend.