Thank you for posting your question here, I will try to answer it to the best of my abilities.
Seems like you're suffering from intermittant claudication as a result of a blockage in your arteries so that you're legs arent getting enough oxygen
. I recommend you see a doctor and ask him to run a doppler ultrasound
on your legs to find the blockage, if it is indeed there.
My diagnosis may be wrong, but I like to start by ticking off the obvious possibilities first.
I hope my advice helps you.