If you've ever had negative symptoms what did you experience?

I've been flat and blah feeling for days now. I need to speak to my psychiatrist, but have to wait until the 19th. I was just thinking that maybe I've been feeling some negative symptoms. I have no motivation. Can't think straight. Haven't laughed in days (and normally I laugh a lot!).

I just don't know what's wrong with me. I'm not depressed.