In over my head?

I would just like to run this by a few of you............any advice would be appreciated!

I just took a job last week at a hospital based pain clinic (invasive procedures such as radiofrequency ablations, epidural steroid injections, discograms, ect...... most with the use of conscious sedation). I have no previous experience with procedural pain management but with the economy the way that it is I was extremely happy to be offered the job. The interview went fantastic and I was told I would have at least one month of orientation to the clinic. First day on the job I learned that the only nurse (my mentor) that knows how to do the procedures will be leaving this week. That means my orientation will consist of 5 days before that nurse leaves for 3 whole weeks. I am not ACLS certified and I have very little experience with conscious sedation and I am expected to run an entire pain clinic by myself after only 5 days?!?!??! I am extremely overwhelmed and honestly scared out of my mind. I won't even be able to see all of the procedures by the time my mentor leaves and I am expected to know how to run an entire clinic (up to 25 patients a day). I am also concerned about the legal aspects of the clinic. Two physicians operate out of the clinic---one who conservatively does procedures on 4 pts a day, the other who sees 20 pts in a 5 hour block and not only expects the nurse to administer the fentanyl and versed but also expects me to be able to monitor the pt and be his personal scrub nurse at the same time. I just feel in over my head. What do you all think? Should I just try to do my best of bring this up to my manager and the HR department at the hospital?? Thanks

I've never worked in a pain clinic, but this. . . why in God's name would they do this to you?? It makes me very, very angry. No, I wouldn't set foot in there. Your mentor may just have to postpone her vacation. Since it's hospital based, maybe there are more resources available to you. grrrr