I have an invisible illness and literally the only person who ever constantly understands and shows compassion at all times is my dh. I have three friends who have a good understanding of it but have never actually seen me at my worst (because I don't leave the house when it's at it's worst) - two of them (married couple) are very compassionate and understand my limitations/ frequently ask me if I'm ok to do certain activities, and the third has a good understanding of it because his mum also suffers from the same condition. My parents are great as well. Oh, and my boss, who is a diamond and can always tell when I'm struggling. But those six still don't quite understand just how much of my life it effects all the time - they, at least, try very hard to understand.
It changes everything. Everything. And I look so bloody normal, people generally think I'm faking it, using it as an excuse - I work bloody hard to keep up appearances, keep going in the day when I'm at work or other people are there, that when I'm having an intolerable day people can be quite shitty with me and I have to remind them that I have health problems which, frustratingly, they can't believe are that bad because I try so hard to hide the extent of it. I want to say to them: I take so many pills I rattle! I genuinely worry about my future health - I feel like I'm having to choose between my health now and my health in the future. Fucking scary, I tell you.
Yet despite all this, I don't blame people for their perceptions. I believe people are fundamentally good and compassionate - but that they need to be able to understand. Hidden illnesses are hard to comprehend because there are no nice visible signs. I have a walking stick. I don't need a walking stick - in fact, the stick actually exacerbates the condition if I were to use it all the time. But I use it when I really need to because people can at least see something that makes them understand there's something wrong with me. People don't mean to be inconsiderate, I don't think. If they can be made to understand, I ink the vast majority would be very compassionate.
Tl;dr - I support this, OP.