The black and flat bug found on your wall and bed is a bed bug. These type of bugs are parasitic insects that feed on human blood. They belong to the genus Cimex and can refer to any member off the family Cimicidae. Visit http://en.wikipedia.org/wiki/Bed_bug for more information.
Sounds like it might be bedbugs to me. They are extremely hard to get rid of too. I'd call an exterminator ASAP. We had a run in with them at a hotel, and they freak me out. Here's a site with some info on them and figuring out if you have them. http://www.badbedbugs.com/