I’ve had anxiety on and of since at least when I was 10years old (am41 now). A few years ago I was also diagnosed with dysthymia (PPD). I know anxiety, I am very familiar with it. Now though, I realise sometimes that my anxiety levels drop but I still feel just as awful. I am guessing this is depressive feelings? They can be almost as overwhelming as the anxiety at panic levels but it feels strange to me feeling this awful when anxiety is low or not present. 
Is it possible to have anxiety and depression at the same time? It all gets confusing to me when almost contradictory feelings (the aggressiveness of anxiety and the sort of passiveness of the depression) exist in me at the same time. 
Never felt like this before… :(