Missdiagnosis?

I have been paranoid and anxious about being schizophrenic for the last 6 months, but more recently I have been worried about becoming a psychopath, which could be why I'm so worried about what I experienced last night I just want a second opinion.

Last night I was laying down (not sure if I was half asleep or not) and heard a voice inside my head say "i'll take these two, you take the other one, I freaked out and got out of bed thinking I was hallucinating hearing a voice telling me to do something harmful to my boyfriend (as he was laying next to me). I tried to shrug it off and closed my eyes again, i then seen a figure/shadow in the corner of my closed eye with a axe. I again freaked out and kept telling myself "this is it i have lost my mind for good this is the moment of uncontrollable schizophrenia" I thought I was having some kind of psychotic episode, I was aslo contemplating taking my self into the hospital. I then in the pile of clothes on the floor thought I saw somebody's legs until seconds later realised how stupid it was and it was just clothes. I eventually fell asleep, to awake today feeling somewhat normal but depressed, and scared to face the world incase I hallucinated or lost my mind in public.

I have been seeing a psychologist for a few months now, and am being treated for GAD. I have been on a low dose of lexapro for just over two weeks which has helped with some physical symptoms associated with my anxiety but not to my thought pattern or disconnected thoughts and my strange perception on external stimuli.

Could this possibly be a slow onset? Has anyone else experienced this in the beginning of their illness?

Thanks.