you try to be honest about your situation and simply say, I'm sorry but this isn't something I can do right now. which btw takes a lot of guts to say and admit! and they respond with the guilt trip & lack of understanding & just stupid remarks of "well if you can do *that* then you should do *this*" 'it's not that much more/different/harder.....'

you try to do what's best for YOU and your health, and they be-little you for doing so! YET if it were someone else, they'd probably be just fine with it. man, some people these days