I totally understand what you're saying, and how it makes one feel to even have to question things like that. It's hard to think that something might not be what it seems. If we all just accepted everything as it looked at first glance, we would be in a heap of trouble. I feel it's good to question things (especially if you suspect that it isn't true). It's hard to come out and say what we think, because people may judge us. It is so awful to think that someone would try to pose as a sick child to get money; but people do it every single day. That is our reality now, and it's so sad. It brings out so many emotions in me. I'm a very empathetic person, so it just kills me to see things like this happening. For example, the little boy you're talking about. It is so heartbreaking that if someone is posing as him, they're getting all of that money for themselves when the actual little boy really needs and deserves it. I, like you feel guilty when I have suspicions like this. My intuition is telling me one thing, but there could also be a chance that I'm wrong. If I'm wrong, I always think of how awful that would make me for thinking something like that. In this time tho, we HAVE to be leery of things.
I hope you are wrong that someone is posing as him, same as I hope I'm wrong as a lot of the things I've thought in similar situations.
On a side note, I work for a woman that is in her 9th year of kidney failure. We are in the USA. She has been on dialysis for her condition for a very long time, and she too has several health issues mostly stemming from the kidney failure. She is in her late 40's, so I have some experience with the disease the little boy has. After so long of being in kidney failure and dialysis, it WILL start to have an effect on your brain. You can develop psychotic tendencies, or you could just loose motor functions. Anything can happen. To get to the point, she was raised here (and was smart); but her condition has changed her. It has changed her ability to write, get a point across, spell, etc. So you are not wrong for thinking the way you do, because it does seem kind of strange to me as well based off of what you have told me. There are just so many things that could factor into that situation that would make someone believe that the person might not be who they say they are.