I'm 15 and from the UK, where I'm in year 10. Since coming to high school, I've been very unhappy because I'm shy and have difficulty making friends, but last year I realized that I had feelings for my teacher. Since then, more than a year has passed, he still teaches me, and although I've tried to control my feelings, they've deepened into something more like love: I feel so nervous when I'm around him - I go all shaky, my heart pounds, my breathing becomes shallow, and recently, I've been feeling anxious and paranoid because of him. I think I am suffering from depression, as I feel like crying all the time and have suicidal thoughts daily. I feel like I'm on my way to a mental breakdown because I have no one to talk to about any of this. I've tried to forget about my teacher, but I can't; it is not a "crush", and I really need advice on what to do because my GCSEs are on the line, as well as my mental health. Please can you help me?