pins and needles in hands and feet and headache

Hi all
Today I joined a gym for the first time in a few years. I spent approx 2 hours there, my last activity being 30 mins on an elliptical machine. I was on a low level but being 23 years old and over 17st, that was a last push for me. About half way through my hands began to feel pins and needles, and by the end my feet too. I also had a bit of a headache by the time I stopped. I've been eating well since Xmas, but in general I am massively unfit and before then I ate pretty badly. Last year I asked to be checked for diabetes as i get headaches when im hungry, but tests came back negetive. Any ideas? Thanks so much x