I know where you are coming from. I smashed my foot back in January. The doctor never actually told me how many bones I broke-I don't think he even knows for sure. Anyway, I have a temporary handicap card and believe me, I use it, because walking more than a few dozen feet is quite a trial for me even now. The problem is, since I was permitted to discard the walking boot I look perfectly healthy. I don't limp precisely because I am working hard not to: at my age a limp can become permanent. So far I haven't been confronted or keyed, but it crosses my mind.
Well, I’m fine, but whenever I use a handicapped spot I make sure to fake limp into the store. Just in case...
/s