Free Electronic Cigarettes

I quit smoking cigarettes about two weeks ago, and the last week or so I have felt confused and severely depressed. I can’t remember where I am or how I got there sometimes, or I feel like dying I am so depressed. The weird part is that this usually happens after I eat. I also seem to have lost my appetite. This all could be unrelated, I don’t know. Does this sound at all normal, or should I be concerned? Oh one more thing. I am still getting nicotine from an electronic cigarette. Not as much I don’t think, but still a little.
Thanks so much for all your help. I am still a bit confused though because I’m not too sure its the cigarettes. I have absolutely no urge to smoke. I don’t need a cigarette and then get depressed. The depression comes on in waves randomly. Like after I eat, or while laying in bed. I feel like the world is ending and things are crumbling around me. I guess this would be classified as anxiety as much as depression. What i find weirdest about the whole thing is that I wasn’t smoking for a whole week before I started to feel like this. I was actually feeling better up until recently. Does this still sound normal?