What is me and what is the world?

I had a very interesting experience.I suffered from an illness nobody seemed to understand so it was ” the menopause”, ME, psychological or psychosomatic etc

After about 10 years I had some blood tests.My thryoid was  underactive [  4 years lying on the bed!] Ironically my previous blood tests showed this but the doctor “forgot” to tell me.
What I think is very interesting is after I got treatment I didn’t think I felt any difference but I believed that the  Super Fiendish Su Doku puzzles in the newspaper were being deliberately made easier.I   went shopping and did other activities presumably meaning I had more energy.I began going to an Art Class……. the world seemed different but it was me who was different.That makes one think.