Not a doctor, but I would *think* that it would be fairly difficult to diagnose someone who is still actively using.
Many of those symptoms are similar to post acute withdrawal syndrome and that can last up to 2 years after stopping all drinking. I don't know how a doctor could tell the difference between the two unless there was some sort of brain scan (like a CT scan) that would show the disorder.
When I was hospitalized with neuropathy (thinking it was my spine - I have spinal cysts), the doctors told me there was no way for them to acurrately diagnose me with anything until I eliminated alcohol from the picture.