Shame Rachel. I am sure it must seem that way you sometimes, because you are the one who has the walker, but I am sure that most people don't see you that way. They are just thoughtless and insensitive. Oh, and I wouldn't have given her a brownie either, although it could have given her another reason to remember you next time she sees you! ha ha.
The rest of the world is on another planet. I was once accosted on a packed aeroplane by a stewardess who grilled me very loudly about whether i was sick or scared of flying. This because I have to use a very greasy cream on my face to keep my skin moist, which she thought was sweat and also I have an intentional tremor, so was shaking from head to toe. I thought it was quite funny, but I have determined to see the positive in every side of this illness that I get the opportunity. I like Lance Armstrongs motto, Live and finish strong!
We all understand. Most of us have no outward sign of illness, so are faced with people wondering how you can be sick, when you look well (a malar rash can give you beautiful rosy cheeks!), so some on this sight might be jealous that you have some evidence! Joke!
To not have a diagnosis is a very hard place to be and its stressful and frustrating. Hang in there. There will be a breakthough for you around one of the corners of life.