Oh ~Christina I'm so sorry this happened to you. *sigh*
I do hope you are feeling better very soon. It's no fun getting that dehydrated, everything hurts when that happens, been there done that, even my hair hurt!
I have a rule for myself that if someone cannot get a line into a vein by the 3rd try, I demand someone else try it. Luckily enough, it's not happened often to me.
Rest dear one and try to breathe.