Worrying that you're 'faking' your illness or disability

Does anyone else experience this? My life has become so small and I struggle to move around my house some days, but still I have moments where I think 'is this even real'? I feel a deep shame for not being at work, especially when I get a burst of adrenaline and can do more than be in bed or on the couch. Why do chronically ill people self-gaslight?

In the UK, people who cannot earn their own money are being scrutinised and made to feel like villains at the moment. It's not helping. Every time I manage to ground myself in the reality of my health problems and decide to make decisions which are based on self-care rather than fear, it feels like the rest of society is ready to not only invalidate my illness but make me feel like a bad person for being unwell.

How do you cope with these things? I feel like I'm inside hell.

EDIT: Thank you so much for all of your responses- you guys are BEAUTIFUL and my heart is full. Being able to talk to people who are having similar experiences is so so helpful. I would like to respond to everyone's comments but will need to take my time! ❤️❤️❤️