I have a serious problem and I need some advice?

I have had a sore throat and ear ache for over a year and now

My gum at my very back molar is inflamed alittle. I was feeling around in there and at the very far back of the end of the gum I mean all the way at the very back behind where your wisdom teeth would be is so sore when I touch it. I have been to an ENT 3 times with a Ct scan and scopes and they have found nothing. I never had any wisdom teeth and xrays show that i never did develop them either. I have noticed my lymph nodes have become swollen in the last few days on the same side of my neck and behind my ear. So my question is can a bad tooth cause all of this? I went to the dentist who said he didn't think it was my tooth either. I started myself on some antibiotics that I had to see if it helps. Any advice would be great. I am at a stand still as to what is causing all of this.