Question about a possible abscessed tooth.?

I have been having problems with one of my teeth for the last 6 months or so. I went to the dentist and she told me that my tooth was sore because I grind my teeth, but I think it may be much more than that. A few months ago I discovered that I have a very small bump on my upper gum line, but I didn't think it was a big deal. I have been feeling pain in my tooth more often lately and it usually occurs after I drink soda (which I have been doing more often than usual) or occasionally when I wake up in the morning (from grinding my teeth possibly). As of lately, I have been experiencing a harsh throbbing pain in this tooth after I drink soda, as well as a pain on the whole side of my mouth where the tooth is. I have already taken Excedrin and applied sesame oil to the whole side of my mouth, but it is still painful. I have a dentist appointment in a few weeks, but I would definitely like a professional opinion sooner than that. Is this likely an abscessed tooth or could it be something else?