I think, this is depersonalisation, because it's not only feeling disconnected from yourself, but also disconnected from the world around you. My depersonalisation feels like looking through a glass, for example. It's like looking into aquarium, because you can see, what's behind the glass, but you're not there. It feels like being a ghost sometimes.
First of all you need to calm down, because when you're scared or angry, everything seems to be much more intense, than it really is. You're definitely not losing your mind or anything, it's just an intense fear. Anxiety could be subconscious, so sometimes you may feel bad for no reason.