Quitting smoking and I don't feel like myself?

Hi. I've been quitting smoking almost a month now. I do use the e cig every now and then. But not getting as much nicotine as I usually did when I was smoking. I smoked a 1/2 to almost a pack a day. I have not felt like myself since. I feel very depressed I cry even to a cartoon movie I don't think like I should. Everything I think about is so negative. Never anything positive. Also I have been having bad anxiety problems and lots of mucus in my throat that doesn't seem to want to go away. I feel drained all day no energy. I always thought quitting smoking will make me feel a lot better but I am not seeing it. I feel very strange a lot now. What's happening to me?