Is it normal for a bee sting to still hurt a week later? I was stung in the ankle 2 weeks ago, my ankle is still sore and it affects my walking

Depends on where- -the sting was. If it was in the skin where tendons & ligaments are superficial, a tendonitis or ligament inflammation can linger. Ice & OTC NSAIDS can shorten the recovery.
Prolonged reaction t. Unusual to persist more than 1 week, but should resolve in another week. Consider checking with Dr, but notice that "cellulitis" is an abused diagnosis resulting in an appalling overuse of broad spectrum antibiotics. If you have fever, severe tenderness, pus, spreading redness, you probably will benefit from the right antibiotic. Have you used antihistamine? NSAID?