just frustrated

So, this job is panning out to be the most stressful and overly complicated job I've ever had. I pretty much had a mental breakdown today because I felt way overwhelmed, partly because I feel like they put me on the phones way too early for what I'm capable of at this point in my training, and also because my manager made me drive all the way back out to Bristol on my lunch break so that I could basically be a PSR at another office because someone was sick, and this is literally my sixth day on the job, I shouldn't be filling in for anyone. I have decided that I'm going in tomorrow and I'm going to talk to the girl who is training me and let her know that I'm feeling really overwhelmed and that I feel like I need to be more comfortable with the system and with answering questions before I am put back on the phones. I have decided that I'm going to keep looking for another job because I have a feeling that I'm not going to last long at this one, seeing as every day I am either verbally abused or bitched out by a patient or I'm running myself ragged trying to locate files and schedule appointments. I really feel like if things don't improve soon I'm either going to quit or I'll get fired. It sucks, but I really didn't know what I was getting myself into with this.