I need some serious advice, I am not trolling or mentally ill.

I was injected with something that is effecting my central nervous system and I believe is going to kill me. I have complete numbness in my body, you can literally put a knife to my cheek and I wouldn't feel it and my head is in ridiculous pain.

I am currently in the hospital and they said my bloodwork and ct scan is okay and that they are doing a spinal tap tomorrow.. should I tell them the truth about what iis really happening or will they not take me serious and put me in a pysch ward?

I understand I sound insane but this is really happening to me