Standing too long is what ultimately did me in. I was working 3 days a week light duty which was painful, but doable. Then I was switched to 2 days a week to shifts which forced me to be on my feet for long stretches. After a month of this "easy" schedule I could barely walk. To be fair I had yet to be diagnosed with CRPS when my bosses disregarded the advice of the WC doctor to keep me on light duty.

Please heed PF's advice do not quit. But be aware they do not have to accommodate you under ADA if it would cause them a hardship. My city refused to accommodate me, citing low staffing issues.