Hello Katarzyna,
I hope you are doing well.
Medicine: Google "The new England Journal of Medicine". You can find many free articles related to this field.
Psychology: Google "kspope.com". You can find many interesting articles there.
Now, in regard to the last two, it would be convenient if you give me a few examples as to what you consider interesting and entertaining, so I can better assist and help you.
Best regards.