I would encourgae you to get into the dentist asap.
I had a sore tooth 2 yrs ago. First it was just temperature sensitive then it got gradually worse but I kept putting off going b/c I hate the dentist. Big mistake.
I did have an abscess, needed a root canal and by that time things were so inflamed and irritated they had a VERY difficult time getting it to freeze. I ended up in tears after being told I might have a root canal without proper freezing but it finally did freeze but by that time I was so freaked out. It was awful. I would rather have another labor and delivery than go through weeks of dental pain like that again. Learn from my mistake and get your booty to a dentist.
Do you live near a uni with a dental school? Sometimes they do dental work at a very cut rate.