DOES ANYONE KNOW ALOT ABOUT BEDBUGS?

I CHECK MY MATTRESS EVERY NIGHT AND STILL I SEE NOTHING R THEY INVISABLE OR WHAT? ALSO NEED TO KNOW O THEY GO IN YR EARS ,HAIR MOUTH??? EVERY NITE I FEEL PIN STABBING IN MY FEET AND LEGS FEELS LIKE SOMETHINGS CRAWLING ON ME PLUS IVE GOT ABOUT 4 QUARTER SIZE REDISH PINK MARKS ABOVE MY ANKLES LOOIKS LIKE THE SKIN IS PEELING AWAY ITCHES TOO ?????????? ONE MORE GROSE QUESTION IF A WOMEN HAS BEDBUGS AND SHES ON HER PERIOD DO THEY CRAWL IN THERE YIKES