I think I have problem with my throat? Tonsils perhaps or something else? Not sure..?

Okay so i noticed this started happening about Mid november of 2010. The first time i noticed this was when i was trying to sleep and felt like a piece of food was stuck on the back of throat. I jumped and went into the bathroom towards the mirror and looked into my mouth. At the very back you could indeed see something at the back of my throat. It looked like a sore, so wanting to sleep i put my nail back there and felt it. And it came off of my throat. When i examined it, I found that it was white. Sort of dingy brown.. I brushed it apart and it gave off this odor.. kind of like teeth that haven't been brushed in a few weeks. It was obviously disgusting, I washed my hands and went to bed. I thought it wasn't going to happen again until a few weeks later. Another white mass was back there.. I scratched it off and that was that. Now just tonight I realized that my throat doesn't look to.. proportion. There is this lump like thing on the inside of throat. There was a white dingy gray mass on it so i scratched at it and to my surprise.. It bled. I don't know what it is.. I've done a research and i think it is part of a Upper Gastrointestinal disorder. Its not confirmed though. I've made an appt with a doctor this week so i should find out what it is.. right? Anywho... if there are any well educated guesses as to what it is please let me know. Thank you.