This is Dr. David
don't let your anxiety get out of control here.
it would be very very very very unlikely for you to have MS.
MS patients usually can't run 1/2 marathons.
occasional pins and needles is most likely from mild pinched nerve or temporary lack of blood flow into the legs like after you cross your legs for too long.
a protruding lumbar disk on the sciatica nerve could very well cause occasional pins and needles in your legs as well.
it doesn't sound like you have MS
let me know if you have questions.
from training or from low potassium levels or low magnesium levels in your blood.
most likely not from MS
this is called somatization.
and when your anxiety is bad and you are worried about symptoms, then you can develop these symptoms.
your brain can play tricks on you like this.
best is to stop reading and worrying about symptoms that you are reading online
yes, it sounds like you have a good nervous system.
I would not stress about having MS.
don't let your anxiety get out of control.
let me know if you have other questions.if done for now, please leave positive rating below the chat box so I can get credit for helping you todayyou can always reach me with "a question for Dr. David" if you have any other questionshere is my website if you need to reach me again:http://www.justanswer.com/medical/expert-dr-david/Thanks for using JustAnswers.com
you are welcome