THERE ARE PERKS TO NOT FEELING WELL, SOME YOU MAY BE AWARE OF, OTHERS NOT.
It feels nice to be taken care of. You don't have to go back to work. You get to relax. Sometimes you get a monetary rewards like disability. The body can respond sometimes by refusing to get better because of those internal feelings or emotions.
PAST MEMORIES OR EMOTIONS CAN AFFECT YOUR DESIRE TO GET WELL
Say you have a memory of being sick when you were little and your mom took care of you. You felt warm and cozy and wanted to continue feeling that way. Or maybe you got in a HUGE fight while eating a certain type of food and now every time you eat that food you feel sick and now you feel sick with other types of food as well. Even being on disability and not having to work or being taken care of during this time can affect your desire to heal, or an injury while working out once can affect your desire to work out in the future.
THESE EMOTIONS OR MEMORIES CAN CREATE OR ENHANCE THE SYMPTOMS TO KEEP YOU SICK
Memories like those above are powerful. They have the ability to sway your internal thought process from a desire to feel better to not wanting to get well, without you really knowing why it's happening.