Don't worry about a root canal. It so isn't what it used to be. I had two, it took 25 minutes, mainly because it took so long to drain the infection. If it is on back teeth, that is a little more labor intensive, but the entire process is very different now. I didn't have a bit of pain during or after the procedure! It is possible it wasn't caught in your earlier cleaning because it wasn't there or was just forming. Of course, it might have been missed. I always look at my xrays and have them explained to me. They just loves me! 
Well, they actually do but it is because I bring baked goods and jambalaya.
I am sorry your stomach is so upset. I really do hate that when I come home from a dental appointment.
ETA: The drugs after a root canal are awesome!
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