Hospital and heart problems

I'm currently in the psych ward because my mental health has been pretty bad over the last month. I was meant to get discharged on Tuesday.
Anyway it didn't happen because I started getting chest pain, hypotension and sever tachycardia.
I'm really sick and I'm really scared.
I'm not allowed to get out of bed unless I go to the toilet, and just the 3 metres to get there make me want to pass out, cry because my chest hurts too much, and collapse back in bed. But even lying down I'm dizzy and in pain.I hate how aweful I feel.
They're doing lots of tests but the only answers coming up is nothing all they know is I'm having heart problems and my ecg sucks. I'm due to see a cardiologist asap but I'm scared.

They think it might be my new medication, but as its a depot it'll be in my system for over a month and Ill probably be transferred to a medical ward I guess. But it's so shit, I want to go home.