I’ve experienced the latter first hand, and know many other people who have also, none of whom were chronically stressed in any kind of unusual way, as far as I could tell.
Maybe “gaslighting” is a slightly unfair name. I would describe it more along the lines of “patronizing indifference”.
Patronizing indifference describes it quite well. They may run a few tests, then come up with nothing and insult you with the dumbest things.. Its especially bad when you go back multiple times and know more about the disease than they do, and the state of the research (this without spending an obsessive amount of time looking into things).
People's lives are totally ruined by this condition. Other diseases where you may experience pain, or discomfort, or reduced mobility, you may still be able to fight through the pain and achieve life goals. With CFS, the harder you fight, the harder you lose. You can go from being an extremely high achiever who works 3 times as hard as everyone else to get there to then being powerless over your own life, career, etc. The harder you try, the harder you fall. You have to learn to do little every day and hope that you're lucky enough that it'll lead you somewhere, or that some day, something will be discovered and it may help your condition.
The worse part is in many places, you get no help.. You may `appear` fine on the day you go in to the doctor, because it was the only thing you did that day and took it easy the day before because you wanted to at least make it to the doctor. Then they don't get it. Or they'll suggest you exercise, as if that makes your CFS better. Nope.. Because if you go at it a bit (10-15 minutes of light cardio) then you're out of commission for a few days, leaving you feeling pathetic and useless as your loved ones pick up the slack and try to provide you with everything you need and not make you feel guilty, while all you wish to do is get up and do chores or your part, or work, or anything productive, to feel alive, to feel like you're useful at something, have a purpose.
But nope. While there is research happening, the general medical community doesn't recognize CFS for what it is and the systems around it which should offer support don't exactly recognize it either. You're more likely to be referred to a therapist to go do some damn CBT than you are to get help. Telling that to someone who has a degree in psych who's done CBT and has CFS and knows the whole thing inside out is pretty demeaning and discouraging.
Anyway.. rant over.. but yeah, patronizing indifference. Hit it on the nail.