Hi,
How are you now? Have you visited a doctor/physiotherapist?
From what you wrote it seems like you may have damaged a ligament of the lateral compartment of your ankle (swelling). It is good that the x-ray was clear. This type of injury may sometimes cause fractures/microfractures to the calcaneus bone that are difficult to spot in standard x-rays plan. The human body is so amazing that it generally it heals itself somehow. However, with specific therapies the healing process is guided in a more specific and functional manner. Therefore, for now I would suggest to rest your ankle and use walking sticks if needed. I think you should visit a physiotherapist that can evaluate better your clinical case and that can help you giude and monitor the heling processes of the tissues damaged with any technique the therapist thinks is better for your case.
Let us know how your doing.