you need to get it out of your mind that psychosomatic illness is just “making up symptoms” when it’s actually much more like your body is being actively poisoned by chemicals released from your brain
if you’re so stressed that you’re puking your guts up every morning, are unable to eat or keep anything down, you can’t look at light without feeling infinitely worse and feel exhausted and in pain all the time (or whatever your particular stress induced symptom set is) you’re not just feeling like that because you’ve willed it into being. your body is begging for relief from the constant barrage of stress hormones and it requires the fundamental source of stress to go away, not just distracting yourself from the symptoms
just because the root is psychological doesn’t mean the result isn’t an entirely physical process.
This and also “your body is desperately trying to alert you to the fact that stress is killing you”