HORRIFYING delusions of non reality, nothing existing

Hey all,

I'll try to be as brief as possible here. But basically 3 weeks ago I stupidly took a disassociative drug (mxe) with cocaine and had a huge mental breakdown, lost my mind temporarily, shattered my reality and experienced what i can only describe as an eternal hell. My body detached from my mind and apparently I begin screaming and siezuring and smashed my head into glass, just completely went insane.
Since this I've been having on and off profound bouts of nothing being real. It is the most HORRIFYING feeling ever, and so hard to shake, I realise nothing makes sense and it is just the worst feeling I can imagine, it is making me feel reeeeally weird just typing this now. Something in my head questions everything that happens, i'm functioning when the attacks don't hit me but starting to feel hopeless.
I saw a crisis psychiatry team who helped, mainly by giving my clonazepam which helps bring me down after the attacks. Without this I just become an anxious, shaking wreck, heart pounding, severe anxiety attacks, and insomniac.
I am now signed off and waiting to be refererred to a psychiatrist. GP has given me citalopram anti-depressant but she was very ignorant about the whole issue and I am generally not depressed, have never really suffered depression, just massively questioning my sanity and the world, which triggers anxiety attacks.
I've not had any mental health issues in the past, I'm not sure about opening a can of worms if this citalopram is possibly going to make things worse. I do not take any other drugs, I have no desire to touch anything ever again. Even the caffeine of a cup of tea seems to trigger me. I'll just add also that the condition worsens as the day goes on for some reason, by the end of the day I am usually seeing the world in a strange way and questioning everything.
PLEASE if anyone has any advice for this it could really change the scariest time of my life for me?

God that sounds so horrible. I can't imagine how scary it must be for you - it feels really frightening in the way you've described it - not to know what's going on in your mind and then on top of that for the GP to prescribe you something that you don't understand the purpose of. I wish I had some advice because it feels like you really need someone to offer some kind of experience of something similar - but even though I don't I think it's really moving that you were able to tell us what's going on for you and I really hope that things get better with the support you're getting. I think we all can relate to what you said in some way because you told us how you felt so you're not alone in this. I'll be thinking of you and I really hope you'll be ok.

I'm sorry to tell you this, but everything is a delusion caused by emotions. Detach my friend, detach ...

Feel free to obtain a second opinion on citalopram if it makes you nervous taking it, but SSRI antidepressants are often used to treat dissociative disorders.

What is in your life you are not facing? These symptoms doesn't come from thin air.

Be brave, these symptoms are a message that you could live a much better life.