Dental Health Forum - Constant toothache after fillings ?

Hi I'm Theodore, 18 and here's my story; I had a cavity at the lower back tooth that hurts whenever something comes into the hole, so I went to the dentist and have it filled, at the process it didn't hurt even when the dentist taps it so he proceed into filling it with white, teeth colored fillings, I didn't need anesthesia during the process. I remembered the dentist saying that the cavity isn't deep.

After the filling I felt normal, I could even chew food in that tooth without any problems, then after a day or so one problem occurs, I started to have bad headaches on the left side of the temple which goes down just near my left jaw, after a day or two I went back to the dentist to have it checked out, but now it's a different dentist I think the first one is her son. Now she checked the tooth which I got filled, she said that my tooth that got filled shouldn't be causing the headaches since she also stated that the cavity is little and it wasn't deep she even called the other dentist (her son) to rechecked and the same answer; the cavity was not that deep. But she noticed and stated that at the same side of that tooth, that my wisdom tooth is causing the headaches, since she noticed that my gum is somewhat interfering, so she advised me to give it some time and gurgle warm water with salt 3 times a day. At the same day after eating dinner I did what she said, gurgled warm water with salt, and it did hurt a little. The next day the headaches disappeared, I was relief and even started to eat normal again I even eat nuts, but I was still careful and did not chew often on my left side, but after that, the tooth I got filled is now starting to hurt and it's sensitive to temperature even when I breath cold air, and when I try to tap it now it hurts, I just bared the pain and still what my dentist advised (gurgling with warm water w/ salt) the next day the sensitivity to cold and air disappeared but it still hurts a little when I try to tap it or try to push it with my tongue and I still experiencing constant on and off toothaches coming out of nowhere even at night when I try to sleep. But when the toothache is gone my mouth feels normal although it still hurts a little when tapped or pushed by tongue? What seems to be a problem? I think it's been 5 days since my second visit... headaches are gone, sensitivity to temp is gone, the only problem I'm experiencing now are not able to chew on that side since it hurts a little when I tapped that tooth or push it with my tongue, the pain is not sharp just felt kinda awkward, no it doesn't really hurt but the the tooth is reacting, nevertheless I can't chew on that side and the toothaches that is either when I accidentally hit that tooth the toothache would build up later or toothaches that is coming out of nowhere. How could a cavity that the dentist claimed that it isn't deep does this after new fillings?

O yeah I forgot I had two teeth filled one at the lower left back (the one that hurts) and the other at the lower right back (that doesn't give me any problems at all)

I wish I don't need something like root canal D= Would there still be a chance that my tooth will heal by itself? I'm really worried and scared... I never had such dental problems and problems with fillings before. huhu so worried... D=