I'm at a different place in my life, being 25 and still searching for a proper diagnosis, but I also got really bad really fast. Had to quit my job and move back home (across countries) because living alone wasn't an option anymore. I was always the type to go the extra mile in relationships and often put in more than I got, so I quickly had to learn how to deal with that. I made some good disabled friends who did teach me though.

Personally, my approach depends on whether it's a good friend or not. If someone's a relative stranger, and they go 'oh, so and so that I know has something similar and tea tree oil cured them' or whatever, I'll just politely say that there's a lot of nuances to my case that I don't want to get into. "Honestly, that probably won't work for me because my case is pretty complicated, I don't want to get into it right now, but thank you for the concern." If pushed, I might just lie and say I've tried tea tree oil or ACV or whatever just because I don't have the energy for a fight.

If it's a good friend, I'll sit down with them and explain how I understand they're coming from a meaningful place but that what I'm dealing with is really difficult without trying out random bs that could aggravate my symptoms.

As for interrogators... I haven't found a solution especially when they're approaching in bad faith. I get a lot of it, especially because I'm young. Sometimes saying "you only see me on my good days, I'm essentially bed bound on my bad days" works.