@silverfox This is unfortunately a very common problem among people with various chronic illness and disability issues. The core of it is often that people grow bitter about all that they are missing out on -- having a life in the conventional sense, being able to go where they want to go, do what they want to do, hold a job, have children, whatever it is that they cannot do. They see others who can get help -- and feel fundamentally cheated.
It's a bad mentality to get into, because who are you going to argue with over it? Disability and/or chronic illness is not a competition. But because aid is often scarce and takes one battle after another to get, ill and/or disabled people often end up in the mindset that it is a battlefield where you are constantly forced to prove that you are sick enough to warrant helping.
Combined with the constant exposure to toxic positivity (don't let the disease rule your life! you can do what you want if you want it enough!) it is very easy to fall into this kind of honestly depression-adjacent mindset.