Jeeeezzz I am so freaked out right now..........I have my colonoscopy on Friday afternoon at 2.30pm and seriously freaking out.....

I am seriously convinced I have colon cancer, weight loss, on off loose stools but been taking anti-diarrhea med (1 day) plus colofac, so since yesterday I cannot go but did this morning and noticed clear jelly like substance in the toilet bowl (sorry to be so descriptive) & the stool in narrow and small, I am SERIOUSLY loosing the plot here, please help me, ANYONE!