Im not educated enough to know hoe dreams work but i assume its information from the day/fears/thoughts.

I have had dreams of;
Me telling someone i have a brain tumor
Someone telling me someone has an operable anerysm (i read an article about Bruce Forsyth had similar thing and had a dream that i had a visual hallucination - was initmate with my partner in dream and had spider i couldnt push off omy face. I woke up scared this was real but i know it wasnt as it was day time in my dream but dark and night in dream.

I *KNOW* they're dreams but i worry they are foreshadowing