Hey Greensleeves,
The things you're telling yourself are freaking you out. Tell yourself other things. Tell youself the Risperdol and the Benadryl will work and you will feel calmer very soon.
Here's a guided imagery/meditation you could try right at your computer. It's called Secret Garden is free, and though it says it is 29 minutes, the time goes by like 5 minutes and can leave you very relaxed. I hope it helps if you decide to try it:
www.meditainment.com.
Breathe...
ECHOES