Muscle Tingling and Weakness

  Approx. 1993 I began experiencing what I can only describe as tingling in my extremeties, sometimes in my back along my spine.  This occurred subsequent to being rear-ended in a car wreck, ( I wasn't hurt) and it was during a time when I was trying to get healthy by exercising.  I had numerous spinal x-rays which were negative.  I had MRIs of the upper, mid and lower spine (all negative) and an MRI of the brain which showed what one neurologist called a  UGO "unidentified glowing object".  That MRI has been reviewed by 2 additional neurologists and all have said they don't think it's anything.  I was also given a nerve conduction study which was also negative.  Since that time I have continued to experience sporadic tingling in my extremeties and my back which at time, feels like a band circling my legs and/or back.  I also have experienced muscle weakness -- most noticable when I'm typing on my computer for extended periods, or when I am sitting still for more than an hour.  However, the weakness can occur also after I've moved heavy objects or, it just happens for no reason at all.  Lastly, I get what I call muscle jumps.  I can literally watch my skin move up and down when the muscle jumping occurs.  This jumping doesn't happen often but it only occurs in my extremeties.  I have not noticed the jumping happening more so on the front  of my arms and legs as opposed to the back of the arms and legs.  It feels as  though I need to have my back popped.  All of these symptoms can occur for no reason at all.  I haven't been able to tell if the symptoms occur more so when I'm under stress or when I'm tired.  Lastly, I notice when this tingling/weakness is taking place, I seem to have a more heightened sexual arousal.    I am afraid to go back to the dr. because the last time I was scared to death when one of the nurses convinced me I most probably had MS.    I had some other blood work done (I don't recall all of the tests performed) but those were all negative.  Is there any insight you can provide?  
===========================================================================
Dear CRB:
Although MS and cervical spodylosis (degenerative spine disease) are possible, I think the are rather unlikely. After reading the evaluations you have had, and also your current symptoms, I suspect that you do not have any serious neurological problem. Muscle twitching of the type you describe are likely fasciculations, are incredibly common in normal individuals.
I suggest that you not worry about your problem any more, and return for further evaluation only if you get new neurological symptoms, or you feel you are getting weaker (losing muscle strength).
Good luck!