Ipod touch, wifi help please./?

i have had an ipod touch, second generation for a year now. i have wifi connection from my home internet router thingy. i have never had a problem with it. all of a sudden, since sunday night, i cannot get it in my room anymore. if i stand in the hallway outside my room i get it, but not when i walk i nto my room. my ipod is like my life, and its been threee days and im getting very frustrated, ive tried everything, HELP PLEAsEEEE!?