Something wrong with dental health?

[Rinto]

I've been feeling a pain in the most back part of my gums. This happened when I had a fever then it continued until I got well. My mother told me that I was growing my wisdom tooth but I told her I'm too young for it (I'm just 15 >.<). Then I consulted a doctor a while ago and told me I had gingivitis and stomatitis.

I kinda didn't believe the stomatitis part at first but I just noticed I had a very white part at the back of my tongue that can't be brushed off by toothbrushes. I still don't believe the gingivitis though. According to my research here on the net, I have to have swollen gums but are painless. But I have painful gums and sore too.

Later, I'm gonna be consulting another doctor for another check-up. But for now, can anyone tell me if you happen to know what I am experiencing?