Do u consider black cat crossing ur path will give u death?

last yr when i was coming back home from my coaching a black crossed my path and i after that i felt ill!!now my health is going adverse day by day !! i am 16 yr old and i am having many stomach problem like stomach heaviness after eating~~also few days ago a very black cat (appearing like ghost)crossed the path of my sister then after sometime my sister"s friend phones rings up and she told that her grandmother is very ill!! so i m thinking that r u believe in this these things ..please ans me .also tell me your story if u have any!!thanks>>>