anxiety on body

lately i ran across something on the internet about delusion and 1 they gave example was a mood neutral delusion when one could think of an extra limb being in back of 1's head! n since i read it i been anxious n feeling srry 4 myself i got paranoid n had images! any advice, i dont understand how 1 disturbing sentence can ruin so far 2days! wut would u do...help (its the images n wut ifs that bother me) i feel so low