Spinal disease? MS?

  I've been wrestling for the last six years with a series of annoying
  symptoms that mostly occur on my right side, including:
  - Tingling/numbness (finger & toetips only)
  - Speech weirdness (due to tightness on right side of tongue)
  - Sexual insensitivity (fairly recent)
  - Muscle twitches (bodywide)
  All of the symptoms come and go simultaneously. They tend to affect me all
  of the time, though sometimes they disappear for a day or two. None of the
  symptoms has been noticeable to others.
  I've had several MRIs, EMGs, BAER tests, VEPs, blood tests, and more -- all
  of which have turned out normal.
  Could this be MS? Spinal disease? Pinched nerve? What should I do to
  diagnose this most frustrating problem?
  FYI, I'm a male in my late 20s.

[CCF Neuro MD msf]

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Dear M,
If MRIs (brain and cervical spine) and evoked potentials are normal, MS is not likely, and if you also had a negative spinal tap, MS is highly unlikely. A pinched nerve would not cause diffuse symptoms. Your symptoms are not specific of any particular neurological disease. In fact, they can also occur in people without a neurological disease, for example as a consequence of chronic stress. If all tests were repeatedly normal (and it looks like you had a comprehensive workup), if your clinical examination is also normal (which I cannot verify over the internet of course) six years after the onset of your symptoms, it could be reasonable to continue to monitor your condition at regular intervals. I understand your frustration, but negative tests rule out many "bad things" (e.g. tumors), and some of your symptoms can be treated for themselves if they are annoying, even without a diagnosis. If your symptoms get worse over time, or if new problems appear, appropriate tests can be repeated to reach a definite diagnosis. Since I am not really involved in your care, I cannot give you more precise answers. You can discuss these issues with your doctor.
Thank you for your question, and good luck.