You make a good point, Mya,
I have always made people aware of my pain & limitations (not that many people took notice many years ago).
I still make people (& medicos) aware of my intermittent symptoms.
I refuse to pretend I am 100% when I'm not.
I also think it's important to keep a diary and records. Last Monday night, I sat at the computer & retyped all my current issues, starting at the top of my head & working down my body.
Surprisingly, I filled 11 x A4 pages of typing (& I would be one of the more mobile members of this forum).
Don't forget the things like eg. decreased hearing (I've had it professionally tested & yes, my hearing is failing).
These type of symptoms may well belong to another health problem besides ME/CFS/FM, but the reality is that before I quit work 6 months ago, I was having trouble hearing on the phone (which was a major component of my job).
Remember to record & diarize the whole picture of your health - Mind, Body & Spirit, not just the ME/CFS/FM physical symptoms.
If you keep a small diary, even just writing "nausea & headache all day today" is worthwhile OR "right hand is numb this morning".
It doesn't take too much energy to diarize small notes for yourself. Don't rely on your memory, it's stressful & too time/energy consuming.
I started keeping a diary to record all the time I worked back at work about 10 - 12 years ago. This is how my record keeping started. I also wrote in this small diary every medical appointment.
I also wrote when I felt dizzy & was bumping into office furniture.
These little purse sized diaries, together with a big box of medical receipts/claims enabled me to write a summary of about 14 years worth of my health life (took me a long time to type it all up, but I did it a few hours at a time, so I wouldn't get too fatigued or exacerbate my neck, back, shoulder pain).
I keep adding to this list of records (& keep the original documentation, test results etc), so if anyone were to query my Health claims, I would have no hesitation in providing proof.
Of course, I was lucky to be of the type of personality type that keeps accounts & records.
ahimsa made a good point - have a list. You can always add/update it before you go to each medical appointment.