Cortisone Shot, can shot wear off quickly. How long should I give it?

I had severe pain in my right foot and extending into my right leg, hip as well for almost three weeks. Went to Er at two week duration as I also had dangerous increase in blood pressure because of pain.

I had severe pain in my right foot and extending into my right leg, hip as well for almost three weeks. Went to Er at two week duration as I also had dangerous increase in blood pressure because of pain.

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Cortisone Shot, can shot wear off quickly. How long should I give it?