Maroo 
I am no doctor - so please, do see and discuss this all with your doctor!!
That being said - before anyone exercises you MUST give your body fuel!! I usually take a 1/2 banana and water - then when we come in from a run, we take MORE water, and maybe 1/2 banana - but some PROTEIN!! a slice of cheese, or a cheese stick.... a small glass of milk (ok fine - yes, I put chocolate in my milk!

and I only do this now that its so cold! when its hot - no milk for me, but cheese is ok!!)
potassium levels are nothing to mess around with!!

Glad you are on top of it and pulled back!!
And ITA with the music - can you imagine -
Dolce is doing this sans music!!!
BUT I want to reassure all HALF and FULL DISNEY marathoners - no music or ipods are NEEDED - nope - none - trust me on this!!! Seriously!! Disney volunteers have got this covered - just the joy of running - but guess what at every mile there is entertainment - and its so sweet!! When dawn finally comes - you see the entrance to the MK - and you try really hard not to cry - going under the water by the Contemporary - no problems - more music... getting to go in the CM entrance - you want to watch your footing - so you cant have music on - then rounding into Mainstreet
It all takes your breath away - you are in a Half Marathon - - you are running thru the MK - lots of characters waving - cheering you on - thru the castle!

Then over to Frontierland - use the bathroom

(whether you need it or not, it will save you from "having" to later on!!)
The lonliest strip is outside of the MK then by the Poly - there is a Scream Team here - it helps!!
but by the time you get passed the sweepers at Mile 10 - - you can do anything!! and then you are so overwhelmed - you are tired of all the crap you thought you "had" to have!!!
Dont know if you like the Judds - but I'm saying they have some inspirational pieces... "I know where I'm Going... doncha wanna come too"
This is the Moment (Broadway - I have it on my ipod sung by Donny Osmond)
EKYLL:
This is the moment!
This is the day,
When I send all my doubts and demons
On their way!
Every endeavor,
I have made - ever -
Is coming into play,
Is here and now - today!
This is the moment,
This is the time,
When the momentum and the moment
Are in rhyme!
Give me this moment -
This precious chance -
I'll gather up my past
And make some sense at last!
This is the moment,
When all I've done -
All the dreaming,
Scheming and screaming,
Become one!
This is the day -
See it sparkle and shine,
When all I've lived for
Becomes mine!
Surely you can see how inspirational this is on my run - but I 'zone out' and then suddenly I hear it . . all the dreaming, scheming, and screaming, etc...
it helps!1
OR how about "Tuff Enuff" (mine is by Wynona Judd)
Gonna Fly now (Rocky - you gotta love the theme from Rocky!!)
do you have "Awesome God" on your playlist? it does help!!
Life Is A Highway (Cars Rascall Flatt)
Life's like a road that you travel on
When there's one day here and the next day gone
Sometimes you bend, sometimes you stand
Sometimes you turn your back to the wind
There's a world outside ev'ry darkened door
Where blues won't haunt you anymore
Where brave are free and lovers soar
Come ride with me to the distant shore
We won't hesitate
To break down the garden gate
There's not much time left today
[Chorus:]
Life is a highway
I wanna ride it all night long
If you're going my way
I wanna drive it all night long