Anxiety is hurting

I am struggling with my anxiety again and it keeps getting the better of me and I am feeling so low at the moment. I'm getting wound up too easily, I think what has triggered it off again is because I started going to toilet a lot and it was getting my confidence down and it's just rolled on from that and I've felt so low in my self! I've been getting moody with my boyfriend I've noticed, last week I hurt myself and if someone says something it hurts me really easily and just now I felt like my mum was been moody with me and we have had a  argument in the car and I started crying and she thinks cause am 19 im been stupid crying over an argument but I'm crying cause I just couldn't take it, it just sets me off really easily and I got upset and annoyed, I know she won't understand cause I've told her before ages ago and she isn't understanding, I feel like she doesn't know how I feel.  I told her I don't want to tell her. When we pulled up outside the house I just ran out the car cause I was so upset ad felt like I was been judged for been stupid :( I can't take it anymore it's getting me down so much. I'm all on my own and it hurts that no one understands me. She hasn't even come to check if I'm okay cause she thinks I'm been stupid :(