So this is what happened: I was at school and I was walking to my table with my lunch and when I put my food on the table, my right knee suddenly collapses. It happened so fast, I don't know what actually happened. When it happened everything was blurry for a moment. After that, I was in pain and felt dizzy and hot(it was cold in the lunch room). Also I'm glad as my knee gave out, I was at my seat and I fall down in to it. I tried to move my knee after a bit but it really hurt. After a couple Minutes, I moved it until it was only halfway straight before I was in pain. My knee still is in pain after 8 hours. This has happened before, but it wasn't as hurt as it is now and last time I also lost my hearing for a few minutes. Have no idea why this has happened I'm only 14. I'm diagnosed with thyroid disease. I have daily pains everywhere, I think my nerves like it mess with me, it gets worse over time. I don't if those thing have anything to do with my knee. I'm really confused and need answers.