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Increasing pain and swelling can indicate infection. Although this could be a venom reaction, it is very important for you to seek medical evaluation because if this is an infection it can be difficult to deal with in the foot, and you should probably be started on antibiotics.
I suggest that if your doctor cannot see you that you go to an Urgent Care clinic or ER.
See this article for more information on see urchin puncture wounds:
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That's why doctors and all of us should never diagnose ourselves. It is hard to be objective about ourselves and realize that "we" could have a problem. I understand. So go on, now! (thank you for accepting0