Maybe there is something on your mind that is bothering you. is there some, for lack of a better term -unfinished business, that might be making you feel guilty for something that isn't really your fault.

for instance - do you feel guilty for not calling your mom or forgetting someone's birthday? - that sort of thing.. Maybe you need to resolve a personal issue for yourself. not trying to embarrass you but, is there a noise disturbance in the area or lack of air circulation in the room?