Hello and thank you for your question. It’s my first priority and pleasure to help you.
I understand your concern.
As per your description,you had history of injury to your foot with heavy weight so it can be possible to have some soft tissue injury to your ankle.
You should take OTC Advil and Zyrtec.
Also apply cool compresses with ice pack wrapped in a cotton cloth for 5-10 minutes twice a day.
Elevate your foot.
And wear ace bandage if you feel pain while walking.
If your swelling 'll get worse over the period of time with severe pain,skin discoloration then you need to see a doctor at ER ASAP.
Other possible cause may include Tendonitis.
X-ray can be advised.
Feel free for further queries. It's good to discuss rather than quit.
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