spying

Help, I dont want to sound paranoid but i am on a network in a home and my ex is the admin on it...(the other roomates dont know about computers). So anyway I started noticing when he would go to work weird things would start showing up on my phone and pc. his phone would show on ip config....just strange things. then my pc was making camara clicking noises but only when he was gone. i know i sound crazy but they are happening. plus the laptop i am on the dvd drive makes the same sound it does when you load a movie but its not opened. Is there a program that i can use to check my pc since the accesss would be through the network.