My stomach hurts & I think theres knots in it?

Well my stomach was hurting earlyer and I felt a knot in it so i took some pills and layed down well abou 30 mins ago i went to the bath room and there was blood in the toilet.

I need help on what this might be.

DO TELL ME TO GO TO THE DOCTOR CAUSE I AM TOMMORW.

I worry about things like this so i need to know what it might be,
 
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