Possible complications from my appendectomy ?

i had an emergency appendectomy dec. 2nd. i was released yesterday i was doing fine but today ive been real weak no fever. and my pain has been a 6-8/10. also ive been having trouble breathing. i know its not a DVT cause they had those compression stockings on and those message stockings on my legs as well. my question is could this be pneumonia i had a pretty bad case in september 2010 and was hospitalized for a week. what should i do ? can i wait till morning to call my primary doctor. ? should i go to the hospital ?