If you have exhausted all your medical intervention and it sounds like you have, have the surgery the sooner the better!
I have gone the same route you have and i would never again go through all that crap of shots and heel pads and the pain. After my surgery I was back to work (i am on my feet all day long) within 10 days.
After surgery you can do some exercise in the swimming pool its a great Cardio work out, and will keep you in shape.
Good Luck and the sooner you make your mind up the faster you can be recovering.
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Don
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