I've known 2 people that continued to use Handicap Parking even though they no longer needed to. The first, parked there when I met her to go for a long walk. The second, parked there because the parking lot was full, and then proceeded to jog for over a mile. Some people do take advantage of these type of situations.

I've found that by going up beforehand and asking nicely for special accomodations, most people will, without an issue. I would suggest that everyone else in your party take the regular route (with one to help you if you need it.) Having a note from your doc on you might help until you learn to exert your rights.

You're probably not going to like this idea, but it sounds like you need a wheelchair, at least for special occassions. Not because it'll get you special access, but because your description of walking in that environment sounds miserable.

Don't let one nasty old biddy depress you.

One last thing:next time ask the Security Guard for his name and his Supervisor's name. Let him know you need it in case his refusal to accomodate you results in a fall or other injury, for liability purposes.