I go through that. Some days I feel so weak and icky and then other days I feel fantastic. I have gotten the same comments. They still make me angry, especially when the people know I have something that, at present, cannot be cured. I lost my temper once and said, "So if I was having a crappy day you would be more okay with that? I have a really good day and now suddenly I'm cured or something? Now I'll never need your help again?" And the ones like, "Well, if you can do that today then you're not that sick." "No, I am just having a perfect day, just like I did 98% of the time before I got this. And you are not going to make me feel bad or wrong or guilty for it." Now I try to ignore that crap because I don't feel like I should have to explain it every damn time it happens. As you said, though, it is hard when it's the people who help you out when you feel awful. Otherwise...ha.
*end bitchy rant*
I am glad you've been feeling good.