I walked two miles in terrible shoes and my feet are killing me? Any ideas for remedies?

I was given a pair of those Ugg knockoffs with the flat bottom that offers NO support whatsoever. I wore them today because I usually do little walking however my ride bailed and then I missed the bus so I ended up walking just over two miles mostly uphill to get home. My feet are killing me. My heels and ankles hurt terribly, to the point of limping, despite popping Advil's all day. My leg muscles also have pretty intense pain and I've felt like my legs were going to give out several times. I called my doctor but he said you can't mess up your feet from one day of bad shoes and refused to make an appointment. I can't afford my hospital copay and don't have a way there anyway, plus i'm not sure it's bad enough to warrant the emergency room. Anyone have any ideas for remedies at home?