Dull aching pain in leg at night that wakes me up in so much pain and can hardly walk what could this be thankyou?

Could be serious. This could represent a lack of circulation to your leg at night. There could be other reasons as well but you should see your doctor as soon as possible for an evaluation.
See your doctor. Pain that wakes you up at night, especially if occurring frequently, needs professional evaluation. Don't wait for it to become a bigger problem.