I completely understand how you feel. But seriously, I think your mum only reacts like that because she was shocked and upset because she loves you so much. And maybe like my mum was, because she was angry not at you but at herself because she hadn't seen it. I think you really should go to see the school psychiatrist. I relate to you, and was really worried and unsure about it, but when I went to see the one at my school she has honestly helped me, and she really helped me to put things in perspective and helped me, I am really glad that I did, and I really do recommend that you do too.
You can get through this I promise, keep posting and we're all rooting for you. *hugs*