Hi there!
Well, without a detailed clinical evaluation it would be difficult to determine the cause of your symptoms. With normal x-rays, major fractures are ruled out while injuries to soft tissue structures such as muscles/ ligaments/ tendons and internal knee structures would need to be evaluated with an MRI. Meanwhile it is advised to rest the leg and limit activities and weight bearing. A crutch may be useful for the same. For symptomatic management it is advised to keep the leg elevated; while ice-packs and tylenol/ OTC NSAIDS may be helpful for pain relief.
Hope this is helpful.
Take care!
And pains slowly spreading from.the knee to the foot.. Its horrible teally bad